Bird hatchlings may be altricial or precocial. Altricial means that the young hatch naked and with their eyes closed, and rely totally on their parents for feeding and warmth. Precocial hatching are feathered when hatched, and can leave the nest immediately.
The reptile hatchling is quite the opposite. Most hatchling reptiles are born with the same instincts as their parents and leave to live on their own immediately after leaving the egg.
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