Feral or free roaming cats

Is it legal to kill feral cats out hunting? or that kill birds in my yard, if i know they are not owned by anyone? Can I kill them if they harass my animals i.e. chickens, dogs, and ducks
Answer: 
A more appropriate solution would be to catch the cats in question in a suitable live trap, and transport them to your local humane society.  I would also advise talking to your neighbors about your proposed actions before trapping.  Live traps are available at many feed and farm stores, and are also good for trapping other pests that may threaten your livestock.
Answered on: 
Monday, March 16, 2015 - 11:30 AM MDT