In 2008 four chicks hatched - but it's thought only three survived.

BBC: Derby Cathedral video proves peregrines hunt by night

Warblers whose nests were thus protected did well, raising an average of four chicks to maturity in the absence of a cowbird parasite.

ECONOMIST: How cowbirds run protection rackets

Twenty kittiwake chicks were hatched in captivity and assigned randomly to four fish diets: high-volume high-lipid, high-volume low-lipid, low-volume high-lipid, and low-volume low-lipid.

BBC: NEWS | Science/Nature | Birds hit by climate, diet shift