Out of the given options, camels are known to sleep standing up. This is because they have a unique anatomy that allows them to lock their legs in place and remain upright without using any energy. Camels can also sleep lying down, but they often choose to sleep standing up in order to avoid predators and conserve energy. Gorillas, flamingos, and ravens do not typically sleep standing up.
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Out of the given options, camels are known to sleep standing up. This is because they have a unique anatomy that allows them to lock their legs in place and remain upright without using any energy. Camels can also sleep lying down, but they often choose to sleep standing up in order to avoid predators and conserve energy. Gorillas, flamingos, and ravens do not typically sleep standing up.
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