From Animal science blog:
Two Iowa Birds on the Verge of Extinction
There are a number of wildlife species that have not fared well in the changing Iowa landscape and have been listed as endangered or threatened.
Endangered species are animals and plants that are in danger of becoming extinct and threatened species are animals and plants that are likely to become endangered in the near future.
The Interior Least Tern and the Piping Plover are among the two species that are there in the list of endangered species and are facing the challenges. This means if steps are not being taken, they can become extinct.
Interior Least Tern:
Interior least tern is the interior population of the least tern which tops the list of endangered species. Dams, reservoirs, and other changes to river systems have eliminated least tern habitat. Least terns prefer the wide channels dotted with sandbars and these have been replaced by narrow forested river corridors.
A resident of sand-flats and shorelines east of the Rocky Mountains, the population of Piping Plovers has declined dramatically due to human actions. There have been continuous loss of habitat and predation of their young.