Abstract
Three species of otter, Lutra lutra, L. perspicillata and Aonyx cinerea, occur sympatrically in the Huai Kha Khaeng river and tributaries, Thailand. Small differences in their use of major sections of the river are described, as are variations in micro-habitat and in food: L. perspicillata is the most specialized fish eater, taking larger fish than L. lutra which also eats more amphibians, and A. cinerea is a crab specialist. However, on all scores there is a large overlap between the three species, especially between the two Lutra, with some evidence for interaction leading to exclusion. Implications for conservation management of the area are discussed.
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