5 ¼” . Considerably smaller than Common with thickset body with broad wings

7 ¼”

Uniform grey-brown plumage

Sooty-brown with dark underparts and a faint pale throat

Alternating, fast on backswept wings, and slow. With shallow wingbeats, almost bat-like fluttery relieved by glides

Very fast wingbeats (not so fluttery) followed by long glides

Broad wings

Long sickle shaped wings

Squared off (with fine spines)

Forked though usually seen as pointed

Rolling twittering ‘chip, chip, chip, chip’

Piercing scream ‘srreeee’