Adults are roughly 12.5 to 13 cm long and average about 10 g. This web page is probably heavier.
Tiny bird, dramatic cheeks
Red-cheeked Cordon-bleu
A pocket-sized finch with sky-blue feathers, a tomato-red cheek patch, and the kind of confidence usually reserved for birds with much larger agents.
The male has a red patch on each cheek. Subtle? No. Effective? Absolutely.
It mainly eats grass seeds and other small seeds, making it the snack-size expert of dry grassland.
Female red-cheeked cordon-bleus sing too, especially around breeding time.
Facts summarized from Wikipedia. Photo by Charles J. Sharp, licensed under CC BY-SA 4.0.