Frozen sperm enables embryo development in endangered Japanese bird for first time—but chick fails to hatch

AI Summary

Researchers used frozen sperm to produce an embryo of the endangered Okinawa rail, a first for the species, but the chick did not hatch. The flightless bird is endemic to Okinawa Island and has been threatened by introduced predators and traffic accidents.

The Okinawa rail (Hypotaenidia okinawae) is an endangered flightless bird endemic to the Yanbaru forest region of Okinawa Island in Japan. The bird has only recently begun recovering its numbers after introduced predators, such as the mongoose, and traffic accidents reduced its population to as low as 820 individuals.