'Humans each have one of these, also called the backbone; hedgehogs are covered with them'
a spine
EXTREME ANIMALS: Humans each have one of these, also called the backbone; hedgehogs are covered with them
Humans each have one of these, also called the backbone; hedgehogs are covered with them
Humans each have one of these, also called the backbone; hedgehogs are covered with them
EXTREME ANIMALS
a spine
EXTREME ANIMALS