Song Is an Honest Signal in a Canary
A male canary in good condition sings, and a canary growing heavy often sings less before anything else looks wrong. Outside the annual molt, when quiet is expected, a male that stops mid-season while his cup stays permanently full deserves a portion review. Fat settles around a canary's internal organs as well as under the skin, and a bird carrying too much of it has less breath and less inclination for the long, athletic songs he produced when leaner.
Notice the timing too. A canary that sings strongly in the morning and falls silent only to doze through the afternoon is different from one that has gone quiet across the whole day. The all-day silence, paired with rich food always within reach, points first at the feeding routine.
The Bath-Time Belly Check
A canary is easiest to assess wet, because flattened feathers reveal the shape that dry plumage hides. Watch your canary in the bath or just after it. A fit bird looks streamlined, with a gentle line from breast to vent. A canary carrying extra fat shows a rounded, almost pot-bellied outline, and you may see yellowish softness through the thin skin over the abdomen when the feathers part.
Between baths, feel the keel as you would on any small bird: a defined ridge with shallow muscle either side is right, while a breast that feels like a smooth cushion suggests the seed cup has been winning. Weigh weekly if your canary tolerates the scale, and record the number rather than trusting memory.
Egg Food and Treat Seeds Add Up Fast
Egg food is the classic canary surplus, because it is nutritious, popular, and easy to leave down too long and too often. Offered daily outside breeding or molt, egg food piles rich calories onto a seed diet that already meets a pet canary's needs. The same applies to treat seed bells and honeyed sticks, which a canary will work at steadily between meals.
Look at what your canary actually selects. A bird with unlimited choice hulls out the oil-rich seeds first and leaves the plainer ones, so a canary on an ever-full cup eats a fattier diet than the mix on the bag suggests. Measuring a modest daily portion forces the bird to eat across the mix instead of mining it.
Flight Strength Between Perches
A canary should cross its flight cage in a few strong wingbeats and land crisply. An overfed canary flies more reluctantly, chooses the hop over the flight, and may breathe visibly after short crossings it once made without effort. Watch during the morning, when canaries are naturally busiest, and compare with what you saw a month ago rather than with another bird.
Perch arrangement can disguise the change. If food, water, and the favorite perch all sit within hopping distance, even a heavy canary never has to fly. Spacing essentials apart makes the bird exercise and makes any reluctance visible to you.
When a Canary's Weight Needs Veterinary Eyes
See an avian veterinarian if your canary keeps gaining on a measured diet, stops singing entirely outside molt, breathes with an open beak at rest, or develops a bare, swollen-looking abdomen. A canary that goes off its food, sits puffed on the floor, or passes watery droppings needs prompt attention, since appetite loss in a bird this small is never a wait-and-see sign.
Bring notes on what and how much you feed, including the extras. Egg food frequency and treat habits are exactly the details that help a veterinarian judge whether the problem is the menu or something medical beneath it.
Noting each day's measured canary feed and song in KinsLe Care Teams lets anyone covering for you keep the same portions instead of refilling the cup out of kindness.