Having two digits, fingers, or finger-like appendages; characterized by two digits.
From bi- (two) and dactylous, an adjectival form derived from Greek daktylos (finger). This is the standard adjective form for creatures with two digits.
The ostrich is famously bidactylous, with just two toes on each foot, which puzzled early naturalists who expected all birds to have three or four—it's a reminder that evolution creates wild variations on body plans.
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