All animals are born with some knowlege of how to do things. like human babys for exsample know how to walk on their own it's just somthing that doesent kick in untill 10-15 months. Parents dont teach there kids how to walk. if you locked a baby in a room by it self it would learn to walk. (aside form the great scicological trama) also human babys are born with the basis of speech all the little sounds they make are really the root sounds for just about any language. or back to the bird, they are born knowing how to beg for food. animals that have lower inteligance levels from a human stand point are born knowing how to do everything, snakes, ect.