Size: Male starlings are generally larger than females, with an average length of 8.3 inches compared to 7.9 inches for females.
Weight: Male starlings also tend to be heavier than females, with an average weight of 2.1 ounces compared to 1.8 ounces for females.
Plumage: The plumage of male and female starlings is very similar, but there are a few subtle differences. Male starlings have a more iridescent sheen to their feathers, and their wing feathers are typically longer and more pointed than those of females. Female starlings, on the other hand, have more brown in their plumage, and their wing feathers are shorter and rounder.
Bill: The bill of a male starling is typically longer and more pointed than that of a female. Additionally, the bill of a male starling is usually black, while the bill of a female starling may be black, brown, or even yellow.
Behavior: Male starlings are typically more aggressive and vocal than females. They are also more likely to be seen defending their territory from other birds. Female starlings, on the other hand, are typically more shy and retiring.
By paying attention to these key differences, you can usually tell the difference between a male and female starling.