Greetings, i have been keeping canaries for last 8 years and have never faced anything like this. My canaries are dying , it is molting season and most have completed their molt but since last 2 weeks i have lost 5 canaries. Once of my canary started sneezing and recovered after a week. The dead canaries have one thing in common. Thin chest, their chest bone is thin like a blade, not sure what it is. Their diet is consistent since spring, multiple seeds kind. Vitamin drops in water, color drops in water, fresh veggies, boiled egg etc. Today most of my canaries are quite and lazy sitting on the floor of the cage. Please help identify the problem.