Hello! Welcome to BYC! So sorry for your losses... Those are tough... I`m sure a good hot wire set up will do wonders for your birds security! Best of luck!
Wow, sorry about the bear. That had to be horrible!
We get visited by bears a couple of times each year. At night, they can't get at the chickens but by day, they are more interested in our suet and bird feeders. We used a solar electric fence around our beehives, and that kept them away from those.