Christophe Courteau / West African giraffe male smelling female in oestrus {Giraffa camelopardis peralta}.
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Christophe Courteau / West African giraffe male smelling female in oestrus {Giraffa camelopardis peralta}.
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Charlie Summers / African elephant (Loxodonta africana), close up of face showing patch of secreted hormone, a sign that the animal is in musth, Ngorongoro Crater, Tanzania, East Africa
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Charlie Summers / African elephant (Loxodonta africana) close up of face showing a patch of secreted hormone, a sign that the animal is in musth, Ngorongoro Crater, Tanzania
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Nigel Cattlin / Close up showing the effect of Gibberellic acid (GA, gibberellin), a growth hormone, on the internode length of nodes 2 - 3 in Barley (Hordeum vulgare) crop plants.
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Nigel Cattlin / Stem and leaf distortion of oilseed rape caused by spray drift & chemical phytotoxicity from a hormone weedkiller, herbicide
