The bird puppies:
As strange as there are buds in everyone, including in birds, the fact is that in the egg the embryo is attached to the umbilical yellow, so it receives nutrition. And when the umbilical cord is peeled, it also dies and the umbilical remains, little noticeable, but nevertheless it is! This is known to any child who has seen how chickens are peeled (gushes/tissues/indyushats and eggs with them).