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New Zealand’s flightless national bird is far from helpless. The males are known to be territorial, and will fiercely defend their turf.

Many of the ancestors of the earliest dinosaurs were small, active and lizard-like animals. Yet their growth patterns have been somewhat of a mystery. Recent studies of their bones suggest that size is not always a good determinant of skeletal maturity.

Frog eggs are typically known for their distinctive gelatinous appearance and the large quantity they are laid in. The mimic poison frogs (Ranitomeya imitator), however, decided to trade in numbers in exchange for parental care.