Life is easier for the five growing lion cubs at the Omaha, Neb., Henry Doorly Zoo & Aquarium than for wild lion cubs. The animals have round-the-clock veterinary care, which has already helped one cub fight a bacterial corneal infection that might have led to vision loss in the wild, and they are protected from pathogens such as canine distemper in their captive environment. They miss out on some lessons of life in the wild, such as hunting and avoiding predators, but their mother does teach them some forms of these behaviors.

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