Canaries normally puff up their feathers when they are sleeping or if they are cold. If they are not sleeping, however, and they remain puffed up for long periods of time, it may mean that your canary is unwell.

How do I know if my canary is happy?

When he's comfortable, you'll see him listening and moving toward you. If your bird is a male, he may begin to sing. Female canaries don't sing, but they do chirp. When your bird feels at home, he'll begin to respond to you with sounds.

How do you know if a canary is dying?

Canaries have high body temperatures naturally because of fast metabolism. They fluff out their feathers to retain heat. A healthy canary will occasionally fluff his feathers, but a sick or dying canary always appears puffy. ... The sick canary's weight loss will cause his body temperature to fall.