A drake Ruddy Duck Oxyura jamaicensis is shown displaying. The feral population of this American stiff-tailed duck is being actively controlled in the UK as it poses a significant potential threat (by inter-breeding) to the genetic integrity of the rare European White-headed Duck Oxyura leucocephala.
![](https://i.ytimg.com/vi/E1enQdmMzgQ/mqdefault.jpg)