I WONDER - Do Turtles Have Bones?

The video explains that some creatures have exoskeletons, which are bones worn on the outside. Instead of teeth, they have beaks made of keratin, the same material as human fingernails. To maintain lightness, their bones are spongy and lightweight.

Describe the structure of bird bones.

How do the bones of birds differ from those of mammals?

• They are heavier

• They are spongy and light

• They are made of different materials

• They are not present