杂食性昆虫是指既吃植物性食物又吃动物性食物的昆虫。杂食性昆虫的种类很多，它们面临危险时采取的自卫方式也多种多样。有的具有保护色，有的有警戒色，还有许多昆虫能将自己变成其他形状，借以避开敌害。
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。
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.
鸦为杂食性，吃谷物、浆果、昆虫、腐肉及其它鸟类的蛋。
They eat grain, Berries, insects, carrion, and the eggs of other Birds.
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