Though storks are considered to be largely silent birds, most species perform some variety of a bill-clattering display. This display reaches its most advanced form in the White Stork. They begin by throwing their heads straight back to create an amplifying resonance box in the gular pouch of the lower neck. As they clatter their upper and lower mandibles together rapidly they produce a loud machine-gun-like rattle that rises and falls in pace.

European White Stork

Order: Ciconiiformes
Family: Ciconiidae
Genus/Species: Ciconia ciconia ciconia