noun which may take the genitive case particle 'no', noun
altricial; altricious
Biological term describing animals born in a helpless state, requiring parental care. Used as a noun or with の to modify another noun.
Sparrows are altricial birds; newly hatched chicks have their eyes closed.
Among mammals, there are altricial and precocial species.
From 晩成 (late development) + 性 (nature, -ity). The exact historical derivation is uncertain; the term is used in modern biology.