A draft report released by the Environmental Protection Agency earlier this month found that three of the most common pesticides in the United States have the ability to harm nearly every endangered species in the United States. Two of the chemicals analyzed, chlorpyrifos and malathion, were "likely to adversely affect" 97% of endangered species.
Pesticides, which are widely used to protect crops from bug populations but invariably end up in the food chain, are terrible for wildlife. Although they aren't linked to death directly, pesticides end up damaging animal populations in subtle ways — for example, by thinning the egg shells of American bald eagles, which meant fewer bald eagles surviving incubation.
Bats love to snack on insects — but insects love to snack on fruit trees that are often riddled with pesticides.
By the time an endangered bat eats a tasty spider, any chemicals the arachnid might have come into contact with have likely bioaccumulated — meaning they have become more toxic as they progress up the food chain. Because of their slow reproduction rate, chemical exposure can be particularly deadly for bat populations.
Endangered cranes that hang out near soybean fields can ingest deadly levels of pesticides.
The EPA recently approved the use of dicamba to be sprayed directly onto cotton and soybean crops, which, according to a press release from the Center for Biological Diversity, would mean that endangered crane populations "[would] be exposed to this toxic herbicide at levels they've never seen before."
Birds like the American bald eagle are in danger of absorbing pesticide particles from the air.
The U.S. bald eagle population has been decimated thanks to widespread use of the chemical DDT. Small amounts of pesticides can leach into the air and water, harming the birds' organs and tissues. Ingesting a fish that has been affected by chemicals can also harm an eagle internally, sometimes resulting in infertility.
Pesticides can also erode the calcium that fortifies eggshells, making the baby birds' incubators thinner and more likely to break.
Chemical runoff harms Atlantic salmon and other water-dwelling species.
Pesticide runoff in streams, rivers and oceans can also have serious consequences for fish and amphibians. Neurological complications and disruptions to natural mating patterns can put members of the species, like the endangered Steelhead trout, at risk.