Snowy Egret & Ring-billed Gull - interspecific kleptoparasitism Photo Gallery by Mark B Bartosik at pbase.com

Snowy Egret & Ring-billed Gull - interspecific kleptoparasitism

Measurements

Snowy Egret
Egretta thula

Means, for males (n = 43), for females (n = 35); (Palmer 1962).
Wing length: males, 259.9 mm; females, 251.2 mm.

Typical adult mass approximately 369 g (Palmer 1962).

Ring-billed Gull
Larus delawarensis

wing (flattened): range for males (n = 11) 369–401 mm, for females (n = 4) 360–377 mm
(Cramp and Simmons 1983)

mass: range for males (n = 48) 495–650 g, for females (n = 51) 375–590 g
(Ryder 1978) (Ontario)

_MG_5972 Snowy Egret & Ring-billed Gull.jpg

_MG_5971 Snowy Egret & Ring-billed Gull.jpg

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