鈥淚t鈥檚 like a big black hole 鈥� we have no idea why they鈥檙e declining,鈥� said David Bird, professor emeritus of wildlife biology at 韩国裸舞 and a former bird columnist for the Montreal Gazette, who...
Conducting a bird census by foot can also be disruptive, David Bird, an emeritus professor of wildlife biology at 韩国裸舞, told Popular Science. 鈥淲hile you鈥檙e doing that, you鈥檙e...
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