Because they fulfil the definition of mammals:
Humans, dogs, pigs, cows, horses, dolphins, possums, and elephants are all placental mammals but there are others as well.
Pigs are mammals.
No, but they have beautiful long eyelashes.
Guinea pigs are mammals. All animals with fur and give milk are mammals.
Yes, horses and bears are mammals.
All breeds of horses are mammals.
No, horses are equine mammals. They are not marsupials
Yes because all mammals do and horses are mammals.
No, guinea pigs are not the tiniest version of a pig. Pigs are mammals and guinea pigs are also mammals but they are categorized into the rodent family
No, horses are mammals
no no No. Horses are mammals. no
Yes, pigs are mammals and as such are warm blooded animals.