Migratory birds, especially those long-distance travellers that winter in sub-Saharan Africa, are struggling with the effects of climate change. Specifically, the trend towards earlier springs is causing problems, because when they arrive at their usual time – between mid-April and early May – nature’s calendar has shifted forwards and spring is almost over.
This is a particular problem for three species that travel from west Africa to breed in British oakwoods: the wood warbler, the redstart and the pied flycatcher. This trio feed their young on oak moth caterpillars, but when spring comes early these have already emerged and are beginning to pupate, so the chicks starve.
