Pied flycatchers are trans-Saharan migrants breeding in Welsh and northern English upland oak woods, with welfare across their extraordinary lifecycle deserving attention.
Pied flycatchers that arrive too late for the caterpillar peak raise underweight chicks that may not survive migration. The phenological mismatch driven by climate change is a welfare problem for individual birds - chicks starve progressively when food supply is inadequate. The extraordinary physical demands of trans-Saharan migration mean birds must arrive in peak condition. Protecting oak woodland habitat and supplementing nest sites supports individual breeding welfare.