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A captive lion sidling up to a lioness seductively. The female was uneasy and backed away, rejecting his advances. The atmosphere was tense and I imagine that she was feeling rather uncomfortable.
A strong male chimpanzee giving me a stony glare.
A litter of feeding piglets being scattered by their formidable father, who was intent on having his share of the feed.
A wild American bison bellowing to establish his dominance.