agachadiza común (Gallinago gallinago)

It is a well camouflaged bird, it is usually shy and conceals itself close to ground vegetation and flushes only when approached closely. When flushed, they utter a sharp note that sounds like scape, scape and fly off in a series of aerial zig-zags to confuse predators. They forage in soft mud, probing or picking up food by sight. They mainly eat insects and earthworms, also some plant material.
Common snipe
An example of the "drumming" sound.
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The male performs "winnowing" display during courtship, flying high in circles and then taking shallow dives to produce a "drumming" sound by vibrating its tail feathers. This sound has been compared by others to the bleating of a sheep or goat; hence in many languages the snipe is known by names signifying “flying goat,” “heaven's ram,” as in Scotland by “heather-bleater” and in Finnish the name taivaanvuohi, "sky goat".

Philip Manson-Bahr is credited with unravelling the mystery of how the snipe creates that unusual breathy sound which is unlike other birdsong. He worked out that the sound was created by placing out two tail feathers at 90 degrees to the direction of flight. When diving these feathers create this unusual sound. He demonstrated this in front of the British Ornithologists Union by inserting two snipe feathers into a cork which he then whirled around his head on a string.

Wing shape does not differ between sedentary and migratory common snipe, suggesting that social selection influences wing shape given this species aerial displays during courtship
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