an order of birds with webbed feet, unusual in the possession of an evaginable penis. They are all aquatic forms, living on animals found in the mud at the bottom of shallow waters and in marshes; som, ürgset päritolu kõrgestiarenenud lindude selts; kaks sgk-a. H-tel on paks tiheda udusulestikuga sulgkate, tundlike närvilõpmetega lühike lai saaghambuliste servadega nokk ja lühikesed ujujalad (ogatii