Could the ammonia in my koi pond be inviting to those pesky flies and mosquitoes?
 
The stink of ammonia in urine, sweat, and rotting meat repels humans, but many insects find ammonia alluring. Now, UConn researchers have figured out how the annoying insects smell it, a discovery that could lead to better ways to make them buzz off.
 
Odd smell: Flies sniff ammonia in a way new to science (phys.org)