Although no bigger than chickens, a pair of 50-million-year-old fossil birds turn out to be some of the earliest known ancestors of today’s giant, flightless birds, like the ostrich and the emu.
Read MoreAlthough no bigger than chickens, a pair of 50-million-year-old fossil birds turn out to be some of the earliest known ancestors of today’s giant, flightless birds, like the ostrich and the emu.
Read More