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There are no similarities, apart from the fact that the spur is located on each animal's hind legs. The platypus's spur is sharp and attached to a venom gland in the platypus's thigh.The echidna's spur is blunt, and is not attached to a functional venom gland.
The spike on a roosters leg is called a spur. they can get sharp so when they get to big you need to file them. for instructions see http://www.fowlvisions.com/?p=39
The echidna has a spur on its hind legs but, unlike the platypus, the spur is not attached to a functional venom gland. The spur is also blunt.
No, only male platypuses have spurs on their hind legs. Young females do have them, but lose the spur by about the age of ten months.
a spur or spurs
Male platypuses have on spur on each of their back legs. Females have no spurs.
The platypus's spur is sharp and attached to a venom gland in the platypus's thigh. The echidna's spur is blunt, and is not attached to a functional venom gland.
spur
spur
ArêteA sharp, narrow mountain ridge or spur, produced by glaciation, is known as an Arête.range
Locate the rooster in the clear marble, just above the sheriff's badge on page 20. The sharp point on the back of a rooster's foot is called a spur.
The male platypus has a venomous spur, not "poisonous claw", on each of its hind legs. Young females also have the spur, but it is not venomous and they lose it by about the age of ten months.