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Difference is size and Snowy Egret has different lores ( region between the eyes and nostrils of birds ) which is bright yellow and yellow iris while the Little Egret has gray lores and paler iris.
Separation from superficially similar Snowy Egret (E. thula) is generally poorly described in the literature.
The Snowy Egret (lower bird) has bright yellow lores and iris. In contrast, the Little Egret (upper bird) has gray lores and a paler iris. The forehead of the Little Egret seemed to slope more gradually accentuating its long-billed, long-headed jizz.
In the breeding season, the adult has two long nape plumes and gauzy plumes on the back and breast, and the bare skin between the bill and eyes becomes red or blue.
Most of the year, the lores are bluish-grey, but in pre-breeding display they become bright yellow, orange, or even flushed bright red in excited birds.
When breeding, the bird acquires distinctive head, chest and back plumes and red lores.