Warblers

‘The warblers were not relying on environmental cues:? the changes in their behaviour were prompted by an internal clock consisting of two fundamental rhythms.? Circadian rhythms, corresponding to the twenty-four-hour cycle of the Earth’s rotation on its...

Geese like letters…

‘..for a moment it was as if we were travelling across the middle of a page, with whiteness and black markings all around us, and geese lifting off the snow like letters coming unstuck.’ (William Fiennes, The Snow Geese)