Sorry about your losses. It's a bummer to lose birds like those. It sounds like you have a fox problem, racoons usually only bite the head off and leave the body, while foxes will take whole birds and only leave some feathers laying around. It sounds like you have a well - built coop now, so that may be sufficient. We live in a raccoon - infested area, and haven't had a problem yet thanks to my dad's excellent carpentry skills. Traps are another option if you need to.