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Avoid galvanized wire that rusts quickly and sheds particles - stainless steel or treated wood are much safer. Size really matters, I agree with the others, but length alone won't cut it: height counts a lot too because canaries fly vertically. To keep it practical, look for at least 80x40x60cm minimum, but if you've got extra horizontal space it'll be even better - the more room for the bird to fly without hitting its wings, the healthier it stays.
It depends a lot on what you're looking for - are you thinking of a canary as a pet or for breeding/reproduction? Larger cages (like 80x40x60cm or bigger) are clearly better because the bird needs space to flap its wings, but a lot of people end up with smaller ones because of limited space at home. What's important is having natural perches (not those plastic ones), good ventilation, and horizontal bars so it can climb properly - that makes a huge difference in its wellbeing.
If you have the space at home, you really should go for the biggest one you can - a canary needs to fly around and not be cooped up! But between you and me, lots of people don't realize that galvanized wire cages rot with humidity if they're near windows or kitchens, so if your house is damp, look for one with an epoxy or stainless steel finish, they last way longer. And something nobody mentions is putting the cage in a spot with natural light but without direct drafts - it makes a huge difference in the bird's wellbeing and he'll sing a lot more!
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