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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 9I制作厂免费 and a former bird columnist for the Montreal Gazette, who created and ran the university鈥檚 prolific breeding colony. 鈥淲e saw after a while that they were breeding well, but the youngsters weren鈥檛 coming back. They weren鈥檛 surviving. What鈥檚 particularly interesting is that the story of the kestrel is happening to other bird species.鈥�