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A black and white gibbon sits on a wooden surface, repeatedly opening its mouth wide in a yawn, with a body of water and leaf-covered ground in the background. A brown bear looks upward with its mouth open, revealing its teeth and tongue, against a backdrop of rocks and foliage. A white lamb stands in a grassy field, its mouth open wide in a yawn, with trees visible in the background. A black and white lemur clings to a tree trunk, its mouth open in a yawn, surrounded by green leaves and branches. A donkey stands against a clear blue sky, its mouth open wide in a yawn, showing its teeth and to