We rarely know the exact date and time an entire species goes extinct, but in the case of the passenger pigeon, we do. Martha, the very last of her species, took her final breath at the Cincinnati Zoo on September 1st 1914, marking the end of a species that was once the most abundant in North America. This was America's first infamous extinction.
I cannot say I was surprised by the recent peer review report on wolf delisting from a panel of independent scientists. They unanimously concluded that the U.S Fish and Wildlife Service's proposal to strip federal protections for gray wolves across nearly all of the lower 48 states was not supported by the best available science.