Figure showing variation in badge size in Male House Sparrows (from Moller 1987). See also the photos below.
A large bib male in my garden flock
A small bib maleReferences
Moller, A.P. 1987. Variation in badge size in male sparrows Passer domesticus: evidence for status signalling. Animal Behaviour, 35:1637-1644. here.
Moller, A.P. 1989. Natural and sexual selection on a plumage signal status and on morphology in house sparrows, Passer domesticus. Journal of evolutionary Biology, 2:125-140. here.