None. All mammals have bones. There is only one fish that is composed of cartilage and no bones, and they are the different species of sharks.
No, a fish is not a mammal. Only a mammal has a backbone.
bats
Whale is a mammal. Human being is also a mammal. So whale should have about 206 bones in it's skeleton. Only number of tail bones should vary in number.
Bat wings are formed by very elongated bones, the same number of bones that we have in our hands. Between the bones (fingers) of bats is stretched a thin membrane of skin. Bats are the only truly flying mammal.
Bones are about the only part of a cow Mcdonalds burgers AREN'T made of
The usual internal organs of any mammal , bones and muscles.Many more vertebrae, and they apparently only vocalize in extreme circumstances.
A bat is the only flying mammal.
Only mammals: 1. have fur. 2. have three middle ear bones. 3. have a neocortex region of the brain. 4. produce milk. 5. have a single fenestra (hole) in the skull below the squamosal and postorbital bones.
Bat is the mammal that can only fly.
No, they should only eat bones made for dogs in the treat deparment for dogs.
No... they have bones just like humans do - except that the bones are much larger.
The only mammal that can fly is the bat.