
A bird perch is the surface a bird stands on for twenty hours a day, which makes it the most consequential thing in the cage and the item most often left exactly as it came. Most cages ship with two identical smooth dowels. Identical is the problem — a foot held in one position all day develops pressure sores the way a person’s would.
Because grip diameter changes which part of the foot bears weight. A bird moving between a thin branch, a thick one and a flat platform loads different tendons and different skin contact points through the day. One diameter everywhere concentrates pressure on the same spots continuously, which is how bumblefoot starts.
A range, centred on one where the bird’s toes wrap roughly two-thirds to three-quarters of the way around. For budgies that is about 1–1.5cm; cockatiels 1.5–2cm; larger parrots 2.5cm and up. Include at least one noticeably thicker perch and one thinner one either side of that centre.
Yes, on two counts. Irregular diameter along a single branch gives variety within one perch, and untreated wood can be chewed, which is a legitimate activity rather than damage. The ASPCA lists safe natural materials for birds as untreated twigs from willow, ash, birch or elm trees, provided they have not been pesticide-treated. Replace them when they are chewed through — that is them working.
The highest perch is where the bird sleeps, so it should be at the back, away from draughts, and never directly above food or water bowls. Leave the middle of the cage open as a flight path between two perches rather than filling it. A cage full of perches becomes a climbing frame with nowhere to fly.
Concrete or textured perches wear nails modestly if the bird chooses to use them and one is offered among several smooth ones. Sandpaper sleeves over dowels do not — they abrade the underside of the foot while the nails stay long. Never make an abrasive perch the only option or the sleeping perch.

See the full bird cage guide or browse Bird Supplies.
Scrape and wash weekly, and replace natural wood once it is heavily chewed or soiled beyond cleaning. Droppings accumulate on the perch under the sleeping spot faster than anywhere else in the cage, and a perch that cannot be cleaned properly is a skin infection risk on the surface the bird uses most.

Two to four in a small cage, more in a large one — with open flight space kept between them.
Yes if monitored. Frayed strands catch toes, so trim loose fibres and replace worn ones.
Only safe species, unsprayed, scrubbed and dried thoroughly first.
Pressure sores on the underside of the foot, usually from identical perches and inactivity. It needs veterinary treatment.
Mostly round, with one flat platform for resting. Larger parrots particularly appreciate a flat surface.
They are smooth, slippery and cannot be chewed. Fine as one option among several, poor as the only one.
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