1. Altricial young are born in a relatively undeveloped state. At birth, the eyes may not be functional, the body may be nearly naked and the animals may depend on the parents for care and protection. The newborn require more extensive parental care as compared to precocial young. Example, humans, songbirds, dogs as pups and kittens (both born blind).
2. The development occurs mostly after birth inside well protected environment (nests).
Precocial animals:
1. Precocial species come out relatively well-developed compared to altricial species . These young can see, run and can find food within very short span of the birth.
2. These animals develop their abilities before they hatch(incase of birds) while they are still inside eggs.