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Bats keep insect numbers down and help pollinate flowers.
The majority of bats eat insects, and thus help to protect plants by preventing insect populations from getting out of control. There are a number of other bats that eat fruit and pollinate flowers, and these help fruit trees reproduce. There are some exceptional bats that drink blood (three species of vampire bat) or catch fish (such as the greater bulldog bat).
Snakes help keep down the rodent population. (Example, Mice) Just Like the Spiders help keep the Insect Population.
Bats use ECHOLOCATION'S TO NAVIGATION around barriers and to find insect to eat.
You can hunt them, or you can set traps for them in your yard, and kill them. That would help control the population.
Abortion
an insecticide is anything that kills insects. if said insect is a crop damaging pest then killing it will help the farmer gain a better crop
No they are not over populated. They help keep the bug and insect population down in Africa.
Mosquito misting will help your yard control the mosquito population but once you stop, the mosquitos will come back.
Predateing
Predators
They keep the insect count low and kill insects that harm plants