Mon Prof Augmenté
Five Fingers in a Flipper
A sea turtle’s front flipper looks like a smooth paddle, but inside it has the same arm bones as a land reptile. The five finger bones are stretched long and held together by skin.
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Age 13: open this week
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In the picture
- Badge 1 marks the upper arm bone in the tortoise’s short front leg.
- Badge 2 marks the five short finger bones in the tortoise’s front leg.
- Badge 3 marks the long, stretched finger bones inside the sea turtle’s flipper.
- Badge 4 marks the smooth skin outline around the sea turtle’s flipper.
Examples
- A whale’s flipper contains finger bones like a human hand.
- A bat’s wing is supported by very long finger bones.
Key takeaways
- Sea turtles evolved from land reptiles.
- Their flippers still contain a five-fingered hand skeleton.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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