Sea Turtles (Junior)
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Lesduur is: 45 minIntroductie
This lesson discusses sea turtles and why they are important for our ocean.
Instructies
This lesson is about sea turtles, some of the things harming them and what everyone can do to help them.
Time: 45 minutes
Contact: education@seashepherdglobal.org
© Sea Shepherd 2021
Time: 45 minutes
Contact: education@seashepherdglobal.org
© Sea Shepherd 2021
Onderdelen in deze les
Slide 1 - Tekstslide
This lesson is provided by Sea Shepherd. Sea Shepherd is a marine conservation organisation with a mission to protect the ocean and marine wildlife. Sea Shepherd works globally on a range of issues impacting the ocean, running numerous direct action campaigns each year. Sea turtles are one species that Sea Shepherd is fighting to protect.
Slide 2 - Tekstslide
During the lesson we will use these icons to identify the learning actions.
Slide 3 - Tekstslide
This lesson is about sea turtles, some of the things harming them and what everyone can do to help them.
INTERACTIVE JOIN – ask students to go to www.LessonUp.app
INTERACTIVE JOIN – ask students to go to www.LessonUp.app
Slide 4 - Tekstslide
Sea turtles have existed for over 100 million years, since the time of the dinosaurs.
Today they are disappearing from the ocean as their numbers reduce. We have to help protect them.
Today they are disappearing from the ocean as their numbers reduce. We have to help protect them.
Slide 5 - Tekstslide
Sea turtle features
Ask students to identify features from the image, or facts they know about sea turtles?
Facts about sea turtles shells:
Ask students to identify features from the image, or facts they know about sea turtles?
Facts about sea turtles shells:
- Shells are made of two layers, one of bone and one of keratin scutes (what finger nails are made of).
- Scutes are like big scales, they are what make the pattern on the back of the sea turtle.
- The leatherback turtle doesn’t have scutes, it has a leathery skin.
- A sea turtle cannot retract it’s head into the shell.
Slide 6 - Tekstslide
Green sea turtles
There are 7 main species of sea turtles.
Green turtles don’t get their name from the colour of their shell, which is anywhere from brown to olive.
They’re called green turtles because they have green skin. They have a hard shell. They live mainly in shallow water near the coast, where they find lush sea grass beds to feed on.
Green turtles will live up to 80 years if not longer. Most of the time they will only ever come to shore to nest.
They grow to 1.5m (4.9feet) long and weight up to 300kg (660lbs).
There are 7 main species of sea turtles.
Green turtles don’t get their name from the colour of their shell, which is anywhere from brown to olive.
They’re called green turtles because they have green skin. They have a hard shell. They live mainly in shallow water near the coast, where they find lush sea grass beds to feed on.
Green turtles will live up to 80 years if not longer. Most of the time they will only ever come to shore to nest.
They grow to 1.5m (4.9feet) long and weight up to 300kg (660lbs).
Slide 7 - Tekstslide
Hawksbill sea turtles
The Hawksbill turtle is really interesting; they get their name from the sharp, curved beak that looks like a ‘hawk’s beak’. The beak allows it to get food from crevices in coral reefs. The shell is very colorful and has a saw-like edge to it.
Hawksbill turtles can grow up to 70kg (154 pounds) and grow to around 90cm (3 feet).
They can live up to about 50 years. Hawksbills are the most endangered of all sea turtles.
The Hawksbill turtle is really interesting; they get their name from the sharp, curved beak that looks like a ‘hawk’s beak’. The beak allows it to get food from crevices in coral reefs. The shell is very colorful and has a saw-like edge to it.
Hawksbill turtles can grow up to 70kg (154 pounds) and grow to around 90cm (3 feet).
They can live up to about 50 years. Hawksbills are the most endangered of all sea turtles.
Slide 8 - Tekstslide
Olive & Kemp Ridley sea turtles
The olive ridley sea turtle has an olive green shell and grows to around 70 cm (2.5 feet). It weights around 45kg (100pounds).
The kemp ridley has a dark green shell and a white or yellowish underside. It grows up to 66 cm (2 feet) and weights up to 50 kg (110 pounds).
The olive ridley sea turtle has an olive green shell and grows to around 70 cm (2.5 feet). It weights around 45kg (100pounds).
The kemp ridley has a dark green shell and a white or yellowish underside. It grows up to 66 cm (2 feet) and weights up to 50 kg (110 pounds).
Slide 9 - Tekstslide
Loggerhead sea turtles
Loggerhead sea turtles get their name from the shape of their head. They have a large head and a reddish brown shell.
They grow up to around 110 cm (3.5 feet) and weight around 170kg (375 pounds).
Loggerhead sea turtles get their name from the shape of their head. They have a large head and a reddish brown shell.
They grow up to around 110 cm (3.5 feet) and weight around 170kg (375 pounds).
Slide 10 - Tekstslide
Leatherback sea turtles
Leatherback sea turtles have a thin layer of tough skin over the shell that gives it the appearance of leather. They are the biggest of the sea turtles. They grow up to around 183cm (6 feet) and weight up to 500kg (1,100 pounds).
Leatherback sea turtles have a thin layer of tough skin over the shell that gives it the appearance of leather. They are the biggest of the sea turtles. They grow up to around 183cm (6 feet) and weight up to 500kg (1,100 pounds).
Slide 11 - Tekstslide
Flatback sea turtles
These turtles get their name from the shape of their shell, which is flat compared to other sea turtles. They grow to around 99cm (3.25 feet) and weight around 90kg (198 pounds).
These turtles get their name from the shape of their shell, which is flat compared to other sea turtles. They grow to around 99cm (3.25 feet) and weight around 90kg (198 pounds).
Slide 12 - Tekstslide
Hatchlings
During nesting season females will come ashore to lay eggs every couple of weeks. They use their flippers to dig a hole to lay the eggs in. They can lay any number up to 200 eggs in a clutch.
After the eggs have been laid, the turtle fills the egg chamber with sand using her hind flippers, and then fills the body pit where she has been laying using all four flippers. So no one knows where she has laid her eggs.
The sand filled chamber keeps the eggs warm until they hatch. The temperature of the nest during this time determines whether the babies will be boys or girls. Warm, dark sand produces mostly females and cool, white sand results mostly in males.
It takes about 7 to 12 weeks for the eggs to hatch, but it then takes the babies (hatchlings) two or more days to reach the surface, usually at night, where they emerge as a group.
During nesting season females will come ashore to lay eggs every couple of weeks. They use their flippers to dig a hole to lay the eggs in. They can lay any number up to 200 eggs in a clutch.
After the eggs have been laid, the turtle fills the egg chamber with sand using her hind flippers, and then fills the body pit where she has been laying using all four flippers. So no one knows where she has laid her eggs.
The sand filled chamber keeps the eggs warm until they hatch. The temperature of the nest during this time determines whether the babies will be boys or girls. Warm, dark sand produces mostly females and cool, white sand results mostly in males.
It takes about 7 to 12 weeks for the eggs to hatch, but it then takes the babies (hatchlings) two or more days to reach the surface, usually at night, where they emerge as a group.
Slide 13 - Tekstslide
What do sea turtles eat?
Young turtles spend their early years floating on the ocean current, so they tend to eat small sea creatures and algae.
Once they get older sea turtles move closer to shore. The green sea turtle eats mainly sea grass, kelp and algae from the seabed, but will also eat other creatures, even the box jellyfish.
Other species will eat a mix of sea creatures like sea sponges, coral, sea worms starfish, shrimp/prawns, jellyfish and squid.
Young turtles spend their early years floating on the ocean current, so they tend to eat small sea creatures and algae.
Once they get older sea turtles move closer to shore. The green sea turtle eats mainly sea grass, kelp and algae from the seabed, but will also eat other creatures, even the box jellyfish.
Other species will eat a mix of sea creatures like sea sponges, coral, sea worms starfish, shrimp/prawns, jellyfish and squid.
Slide 14 - Tekstslide
Do sea turtles drink water?
Sea turtles, like us, need to drink water, but because they drink seawater which is really salty they have a special gland that removes the salt from the water. It is located near their eyes and is like a tear duct that is constantly releasing salt out of their body.
Sea turtles, like us, need to drink water, but because they drink seawater which is really salty they have a special gland that removes the salt from the water. It is located near their eyes and is like a tear duct that is constantly releasing salt out of their body.
Slide 15 - Tekstslide
Breathing and diving
Sea turtles need to breathe oxygen to survive, but because they don’t have gills - like fish - they need to come to the surface to breathe.
Some species, like the green sea turtle, can submerge for up to 5 hours at a time, only coming to the surface for a few minutes to replenish oxygen. Others can only dive for shorter periods - like the hawksbill, which can dive for 45 minutes.
Sea turtles need to breathe oxygen to survive, but because they don’t have gills - like fish - they need to come to the surface to breathe.
Some species, like the green sea turtle, can submerge for up to 5 hours at a time, only coming to the surface for a few minutes to replenish oxygen. Others can only dive for shorter periods - like the hawksbill, which can dive for 45 minutes.
Slide 16 - Tekstslide
Important to the ocean.
Sea turtles help to maintain the health and balance of coral reefs and sea grass beds, by eating some of the species that prey on coral reefs, such as sea sponges.
Sea turtles help to maintain the health and balance of coral reefs and sea grass beds, by eating some of the species that prey on coral reefs, such as sea sponges.
Slide 17 - Tekstslide
Predators
Sea turtles have a tough start to life. Hatchlings face a lot of hazards just trying to make it to the ocean and survive their first few years. Many hatchlings fall prey to crabs and birds as they try to make their way to the sea.
In the ocean hatchlings face threats from large fish and sharks, while adult turtles may fall prey to sharks, seals and orcas.
Sea turtles have a tough start to life. Hatchlings face a lot of hazards just trying to make it to the ocean and survive their first few years. Many hatchlings fall prey to crabs and birds as they try to make their way to the sea.
In the ocean hatchlings face threats from large fish and sharks, while adult turtles may fall prey to sharks, seals and orcas.
Slide 18 - Tekstslide
Illegal poaching
The main reason sea turtles are disappearing from the ocean is because they are hunted by people, for the sea turtle meat, eggs and shells.
Female turtles come ashore in the nesting season, when they lay their eggs on beaches. Sea turtles are slow moving and spend a lot of time digging a nest and laying eggs, then bury the eggs before heading back to sea. Poachers can wait until the eggs are laid before stealing them or taking the female turtle.
The main reason sea turtles are disappearing from the ocean is because they are hunted by people, for the sea turtle meat, eggs and shells.
Female turtles come ashore in the nesting season, when they lay their eggs on beaches. Sea turtles are slow moving and spend a lot of time digging a nest and laying eggs, then bury the eggs before heading back to sea. Poachers can wait until the eggs are laid before stealing them or taking the female turtle.
Slide 19 - Tekstslide
Entanglement
Each year lots of fishing gear is lost or left behind in the ocean by fishing vessels.
These nets float in the ocean catching marine wildlife and can entangle sea turtles.
Imagine sea turtles swimming along and all of a sudden they get caught in fishing nets and lines. They have to float all entangled until someone can help them, but not all of them find help in time.
Ask students how we can help stop the sea turtles becoming entangled?
Teacher’s note: Each year over 640,000 tonnes of fishing gear is lost, abandoned or discarded by the commercial fishing industry.
Each year lots of fishing gear is lost or left behind in the ocean by fishing vessels.
These nets float in the ocean catching marine wildlife and can entangle sea turtles.
Imagine sea turtles swimming along and all of a sudden they get caught in fishing nets and lines. They have to float all entangled until someone can help them, but not all of them find help in time.
Ask students how we can help stop the sea turtles becoming entangled?
- By helping to clean up fishing gear from the ocean.
- Making the fishing vessels clean up their own fishing gear properly.
Teacher’s note: Each year over 640,000 tonnes of fishing gear is lost, abandoned or discarded by the commercial fishing industry.
Slide 20 - Tekstslide
A sea of plastic.
Every day all over the world rubbish is finding its way into the ocean. It is thought that this rubbish amounts to more than one garbage truck every 40 seconds dumping trash in the ocean – imagine all that rubbish floating in the ocean
All kinds of trash is left behind at beaches or in waterways to be washed out to sea, dumped at sea from boats or lost from container ships in storms.
What do you think would happen if a sea turtle finds trash in the ocean?
Could they tell the difference between food and trash?
Teacher’s note: Over 12 million tonnes of trash is finding its way into the ocean each year. This amount is growing each year. It equates to one garbage truck every 40 seconds dumping in the once.
Every day all over the world rubbish is finding its way into the ocean. It is thought that this rubbish amounts to more than one garbage truck every 40 seconds dumping trash in the ocean – imagine all that rubbish floating in the ocean
All kinds of trash is left behind at beaches or in waterways to be washed out to sea, dumped at sea from boats or lost from container ships in storms.
What do you think would happen if a sea turtle finds trash in the ocean?
Could they tell the difference between food and trash?
Teacher’s note: Over 12 million tonnes of trash is finding its way into the ocean each year. This amount is growing each year. It equates to one garbage truck every 40 seconds dumping in the once.
Slide 21 - Tekstslide
How can we stop the trash?
Ask students: “What do you think we can do to stop this trash ending up in the ocean?”
Teacher’s note:
You can discuss things like:
Reducing single use plastics.
Using reusable products.
How to properly dispose of rubbish.
Recycling plastics.
Doing clean ups.
Ask students: “What do you think we can do to stop this trash ending up in the ocean?”
Teacher’s note:
You can discuss things like:
Reducing single use plastics.
Using reusable products.
How to properly dispose of rubbish.
Recycling plastics.
Doing clean ups.
Slide 22 - Tekstslide
Coastal development impacting nests.
In many nesting areas the beaches have become popular places for people to live or tourists to visit. People don’t take any notice of the sea turtles and will drive cars on beaches crushing the eggs in their nests or letting their dogs run loose on the beaches attacking the nesting sea turtles.
Ask students: “Think about beaches everyone goes to, busy with tourists. What things on the beach might stop hatchlings making it to the ocean?”
In many nesting areas the beaches have become popular places for people to live or tourists to visit. People don’t take any notice of the sea turtles and will drive cars on beaches crushing the eggs in their nests or letting their dogs run loose on the beaches attacking the nesting sea turtles.
Ask students: “Think about beaches everyone goes to, busy with tourists. What things on the beach might stop hatchlings making it to the ocean?”
- Leaving things on the beach – towels, rubbish, buckets – that the hatchlings have to climb over.
- Leaving sand castles or sand piled up – make sure you flatten them when you leave.
- Bright lights – did you know sea turtles follow the moonlight to find their way to the ocean? Which means if there are bright lights near by, the hatchlings could end up going the wrong way and get lost.
What do you like most
about sea turtles?
about sea turtles?
Slide 23 - Open vraag
What do you like most about sea turtles?
Ask students to answer the following question using www.LessonUp.app or write on paper:
“What do you like most about sea turtles?”
Ask students to answer the following question using www.LessonUp.app or write on paper:
“What do you like most about sea turtles?”
Write down one issue that we talked about
that is harming sea turtles?
Slide 24 - Open vraag
What is harming sea turtles?
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one issue that we talked about that is harming sea turtles?”
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one issue that we talked about that is harming sea turtles?”
Write down one thing that you can do to
help protect sea turtles?
Slide 25 - Open vraag
How can we protect sea turtles?
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one thing that you can do to help protect sea turtles?”
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one thing that you can do to help protect sea turtles?”
Write down one new thing you have learned today?
Slide 26 - Open vraag
What did you learn?
Ask students to answer the following question using www.LessonUp.app or discuss in the classroom:
“Write down one new thing you have learned today?”
Ask students to answer the following question using www.LessonUp.app or discuss in the classroom:
“Write down one new thing you have learned today?”
Write down one thing you didn't understand?
Slide 27 - Open vraag
What don’t you understand?
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one thing you didn’t understand?”
Ask students to answer the following question using www.LessonUp.app or write on paper:
“Write down one thing you didn’t understand?”
Slide 28 - Video
Sea Shepherd Lesson Activity Sheets provide additional lesson activities or discussion topics to expand the learning experience.
Optional fun video.
Show this video (1.21 mins) which shows sea turtles:
https://youtu.be/UdXQFm33kvQ
Optional fun video.
Show this video (1.21 mins) which shows sea turtles:
https://youtu.be/UdXQFm33kvQ
Slide 29 - Tekstslide
Deze slide heeft geen instructies
