It's a sea urchin.
No. The platypus is covered with dense, waterproof fur, and the echidna is covered with sharp spines.
A sea urchin's body is covered in sharp spines.
hedgehogsporcupinesechidnasthey're the only mammals I can think off
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.
The hedgehog's back is covered in sharp spines. If threatened, it will roll into a tight ball.
Monotremes are covered with skin, but over the skin they have fur. Both platypuses and echidnas have fur, and echidnas also has sharp spines.
to protect it self from other animal
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.
Yes. Both the male and female echidna have equally sharp spines.
An echidna is covered with sharp quills. Its nickname is "spiny anteater" because it has so many sharp quills, or spines, which help defend it against predators.
its sharp spines
its sharp spines