Well there's your problem right there Lou

[Beerball]

http://www.upi.com/Odd_News/2014/10/02/Hyenas-fail-to-breed-zoo-discovers-both-are-male/2581412259890/?spt=sec&or=on

[thebandit27]

http://www.upi.com/O.../?spt=sec&or=on

 

In their defense, it is quite difficult to tell male hyenas from females...although I'd hope zookeepers and vets could do so upon a--ahem--thorough examination.