* Pigs are mammals in the family Suidae.
* Cats are mammals in the family Felidae.
* Rats are rodents in the family Muridae.
* Dogs are mammals in the family Canidae.
* Aardvarks are mammals in the order Pholidota.
While all these animals are mammals, they belong to different taxonomic families and orders. This means their biology is quite different!
Here's a simple comparison:
* Pigs: Have hooves, are omnivores, and are social animals.
* Cats: Have claws, are carnivores, and are often solitary.
* Rats: Have sharp teeth, are omnivores, and are very social.
* Dogs: Have paws, are carnivores, and are highly social.
* Aardvarks: Have claws, are insectivores, and are solitary.
So, the biology of a pig is not part cat, rat, dog, or aardvark. It's its own unique combination of features!