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Echidnas have hair and spikes on their body.
They have big, strong claws for digging.
Echidnas live in thick forests.
An echidna has a long sticky tongue to catch termites and ants.
Echidnas dig themselves into the ground if they are chased.
The hedgehog got its name because of its weird scavenging habits
The hedgehog is nocturnal, which means it comes out at night
They like moist places, which are either over-ground or underground
They eat insects, worms, centipedes, snails, mice, frogs, and even snakes
The echidna and hedgehog had the selective advantage of protection from predation through the use of the sharp spines on their back.
The food avaliability caused the differnece in snout size. This is because the echidna had only ants and termites so it grew and longer thinner snout but the hedgehog had availability to worms, beetles, slugs and caterpillars so its snouts size grew shorter and wider.
The mutation in which the echidna and hedgehog look a like is the spines on their back. This was caused by the attacks from preditors grabbing the echidna and hedgehog from above. The echidna and hedgehog differ in some aspects, one of which is food availability
The hedgehog and echidna are both spiny mamals. The main selection pressure that caused these small creatures to evolve the same is predation. But they have evolved slightly differntly from food availability.
Side note:
convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.