precocial
/prɪˈkəʊʃ(ə)l/
adjective
Zoology
1 (of a young bird or other animal) hatched or born in an advanced state and able to feed itself almost immediately.
1.1 (of a particular species) having precocial young.
Origin
Latin praecox ‘mature before its time’) + -ial.
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Benjamin enjoys closely studying animals, particularly precocial ones like turtles which fend for themselves immediately after hatching. He's ten and his family thinks him precocious.