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To more easily catch the insects that the sheep disturb when they are grazing.
Cattle egrets are commensal animals. They consume the insects that cattle and livestock disturb while they are grazing in pastures.
Deserts are a delicately balances ecological system capable of supporting only a definite load of biological component, nevertheless less hot deserts generally have birds, mammals, insects and reptiles as well as many species of hardy plants. The balance can be altered by:the introduction of grazing animals in plant heavy areasmor sporttic rainfall or the lowering of aquifershunting or poaching of rare species
Tapirs probably do eat some insects because they are grazing animals. They actually eat mostly plants and are classified as herbivores.
It is the fact it reduces population of smaller rodents insects and reptiles in its ecostytems
Jon F. Harrison has written: 'Ecological and environmental physiology of insects'
Because as you walk, you disturb insects in the ground, then fan tails fly and eat them :). Rachael owes me a cake
Frogs have an important ecological role as eaters of insects. There is also a certain cuteness about them. They are the inspiration for Kermit the frog.
The cowbirds remove ticks from the bison, while the bison disturb insects that are picked up by the birds.
Most species of ladybugs eat plant-eating insects and aphids are their favorite food. The aphids eat the plants, and the ladybugs eat the aphids. Then, larger insects and birds eat the ladybugs.
Insects are not a part of a buffalo's normal diet, which consists of grass. But they doubtless swallow some insects accidentally while grazing.
By becoming a dominant race or wiping out other communities/populations. Take the Cane Toad for example. This toad was introduced into Australia in the late 1900's to reduce the amount of insects affecting crops, but ended up multiplying dramatically and in the end becoming a very dominant race in the area. Their poisonous as well which makes predators VERY few.