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- Type 2 yawns in long-tailed macaques. Top
row: phase 1, front left to right: an adult
male, an adult female with her young, a
sub-adult male and a juvenile male; second row:
phase 2 at the maximum of the yawn in adult
males; third row: phase 2 at the maximum of the
yawn in females from left to right, two adult
and two sub-adult females; bottom row: type 2
yawns, maximum of the yawn, in two male
subjects, when juvenile (a1, b1) and later when
sub-adults (a2, b2)
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