1) Bird genus 2) Corncrake genus 3) Corncrakes 4) Genus crex 
Crex is a small genus of birds in the rail family. It contains two species, the corn crake, C. crex, which breeds across Europe and Asia and winters in southern Africa, and the African crake, C. egregia, which migrates within Africa. Both are short-billed rails with blackish-brown upperparts, mainly blue-grey underparts, and barring on the flanks....
[n] - corncrakes
genus Crex noun corncrakes