Cage Size and Bar Spacing: Get the Measurements Right

Parrot perched inside a spacious cage
Wider is better than taller: birds move horizontally, not vertically. Photo: Jaime A. Headden ( User:Qilong ) — CC BY 3.0

A cage five millimetres too wide in bar spacing or ten centimetres too shallow becomes a lifelong compromise. Here are the measurements, species by species, and traps to avoid.

Budgerigars on a perch
Small species need narrow bar spacing, or they can trap their heads. Photo: Benjamint444 — GFDL 1.2

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Photography credits: Jaime A. Headden ( User:Qilong ) (CC BY 3.0) via Wikimedia Commons