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Five Fingers in a Flipper
Age 13 · Biology
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
Browse Age 13
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.
Quiz: Five Fingers in a Flipper (Age 13)
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What does the skeleton inside a sea turtle’s flipper show?
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Where did sea turtles originally get the arm bones found in their flippers?
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How do the finger bones sit inside a sea turtle’s flipper?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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