310
A lek, from the Swedish word for "play", is an aggregation of male animals gathered to engage in competitive displays, lekking, to entice visiting females which are surveying prospective partners for copulation.


524
The ruff is a wader in the large family Scolopacidae, the typical shorebirds.Recent research suggests that its closest relatives are the broad-billed sandpiper, Calidris falcinellus, and the sharp-tailed sandpiper, Calidris acuminata.