Bats are a unique mammal and an important part of ecosystems. One of their effects is to keep certain insect populations, like mosquitoes, under control. Like many mammals, they have relatively long lives and have few offspring, so there are worries that bat populations may not be able to recover, especially if wind turbines continue their expanse. And unfortunately, because many of the species being killed are migratory, the effects on ecosystems in Mexico could be effected by wind turbines in Canada.
If wind advocates have their way, wind power would expand almost 7x, up to 20% of U.S. electricity (ok, between 0% on windless days and flooding the grid on too windy of days), and require about 20,400,000 acres of land (37,500 square miles, larger than the state of Indiana).
Below, some gratuitous baby bat cuteness.