Spicules
An echidna's body is covered with spikes, or spines. These spines are not poisonous, but they are sharp and offer the echidna protection from predators.
Yes. While many people believe echidnas only have spines, they are actually covered with a very thick layer of coarse hair. The sharp spines grown throughout the coarse hair.
Whether or not an animal contains a spine or backbone distinguishes animalia into two different groups: Vertebrates (with spines--examples: canines, felines, humans) and invertebrates (without spines--examples: sponges, worms, mollusks).
All fish have spines. They are all vertebrates.
All sponges have a skeleton made of a protein called spongin or mineralized structures composed of calcium carbonate or silica.
Yes. All mammals have spines.
All reptiles have spines.
Yes. All mammals have spines.
First of all, they're called QUILLS! And it's to protect themselves.
No. Hummingbirds have spines. All birds do.
all snakes have bones because of their backbones
Yes. Possums are mammals, and all mammals have spines.