chough: a European corvine bird of small or medium size with red legs and glossy black plumage
passerine: perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless
dyne: a unit of force equal to the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 gram