Ivory-billed woodpecker, 22 other species declared extinct

The ivory-billed woodpecker was perhaps the best known species the U.S. Fish and Wildlife Service on Wednesday will announce is extinct. It went out stubbornly and with fanfare, making unconfirmed appearances in recent decades that ignited a frenzy of ultimately fruitless searches in the swamps of Arkansas, Louisiana, Mississippi and Florida.

Others such as the flat pigtoe, a freshwater mussel in the southeastern U.S., were identified in the wild only a few times and never seen again, meaning by the time they got a name they were fading from existence.

“When I see one of those really rare ones, it’s always in the back of my mind that I might be the last one to see this animal again,” said Anthony “Andy” Ford, a U.S. Fish and Wildlife Service biologist in Tennessee who specializes in freshwater mussels.

The factors behind the disappearances vary – too much development, water pollution, logging, competition from invasive species, birds killed for feathers and animals captured by private collectors. In each case, humans were the ultimate cause.

Another thing they share: All 23 were thought to have at least a slim chance of survival when added to the endangered species list beginning in the 1960s. Only 11 species previously have been removed due to extinction in the almost half-century since the Endangered Species Act was signed into law. Wednesday’s announcement kicks off a three-month comment period before the species status changes become final.

Around the globe, some 902 species have been documented as extinct.