than to the true boobies.

Description

Sulids measure about 60 to 85 cm in length and have a wingspan around 140 to 175 cm. They have long, narrow, and pointed wings, and a quite long, graduated, and rather lozenge-shaped tail whose outer feathers are shorter than the central ones. Their flight muscles are rather small to allow for the small cross-section required for plunge-diving, as an adaptive trade-off relative to some sacrifice

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