Somehow they've either avoided you because you've had a dog or animal that deterred the predation or there's perhaps been a jump in the numbers in the predator population. Raccoons can get at them at any height and they will! A friend recently had a fox jump a 6' fence right in front of her in...
You HAVE to give these poor defenseless animals a place that they won't be subject to predators breaking in- that's the only way. A fox, coyote, or even raccoons could be doing this, and they won't stop until the last bird is gone. They'll come back when you get more. The only reason it's all...