This is a female White Crowned Sparrow which can be distinguished from a male as it doesn’t actually have a white crown.
This is called sexual dimorphism: where the different sexes of the same species look a little different. To give a counter example: Bald Eagles are not sexually dimorphic by coloring. You may not be able to tell if a Bald Eagle is male or female because they look very similar, only their size is different. But many birds are sexually dimorphic and the females and males are distinct in coloring and/or patterns.
BAM☺︎
