Well, I've had backyard chickens for a year and a half now and have been loving it, but about 5 months ago I added a "female" Blue Indian Runner duck I got while away at camp this summer. I raised her—I just found out she's not a her 10 minutes,so I don't know how I'll stop calling her that—from only 9 weeks old until she was about 14 weeks old and then I returned home and added her to my flock of 4 chickens. At first, the chickens shunned her, but after a month or two of following them around and being constantly chased off, she broke into their clique and truly became one of them. She now roams the backyard with the chickens foraging and eating with them all day long. She just recently started going up into the coop with them to sleep. The problem is, I've seen her before nibble at the back of the necks of the other chickens, and I have been suspecting it for a while, but after doing a little research I'm 95% sure she's actually a boy (she has the curved tail feathers) and may be trying to mount the chickens. The chickens usually just ignore her and walk away when the duck does this, but she tends to follow them around nibbling at their necks and walking behind them. I know they prefer to mate in the water, but will a duck try to mount a chicken on land? Is there any danger in keeping the duck around? My family adores the duck, and the duck gets along so well with the chickens. The chickens are fully capable of defending themselves in most situations and are much faster than the duck if they need to be. Is there any chance the duck will hurt them if she is indeed a sexually frustrated drake? If this is a problem, what's the solution? Do I need to get rid of the duck? Or—if I were able to find a female Indian Runner (or another breed of duck)—would introducing a female duck to the backyard flock solve the problem? Thank you for any advice you've got for me!