root praecox, the same root as in precocious, meaning early maturity.

Superprecociality

Extremely precocial species are called "superprecocial". Examples are the megapode birds, which have full-flight feathers at hatching and which, in some species, can fly on the same day. Enantiornithes and pterosaurs were also capable of flight soon after hatching.

Another example is the blue wildebeest,

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