Whats wrong with my 2 chickens

[nv-chkn]

Twice i had wild small doves get inside the coop ,and my chickens beak-ed the dove to death and eat little of it .... Maybe that wild bird had some disease ....

 

[drumstick diva]

I'm wondering if they have gapeworm - you could put that in the search box and see if the symptoms match their behaviors