not unusual at all the kittens and puppies are fed by the parent in exact same way as humans get nourishment but through individual umbilical cords to each sack that contans a puppy or kitten if you have ever seen them being born the parent will detach the cord by eating the sack then chewing through the cord so in effect the animal has a belly button also just not as visible as a humans . al animals cords are attached to the single placenta in the womb of the mother there no seperate placentas for each puppy or kitten thats the only difference only when human twins are presant is a single placenta there but in non idendical twins a human has two placentas . |