They are omnivorous and play a key part in the ecology of these rivers eating fish plants and insects but also acting as prey for dolphins, caiman and larger fish.

杂食性的水虎在这些河流的生态环境中扮演的非常关键的角色，它们在扮演昆虫、鱼的猎食者的同时也被河豚、鳄鱼和其他大型鱼类所猎食。

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The omnivorous creatures can live for more than 50 years, feeding on fish, insects and water plants.

BBC: Cornwall