This bird shown in an illustration is distinguished from the heron by the bustle of feathers over its rump
Herring Gull is distinguished by the black [DOC] [TLE] Sandhill Crane, Identification, All About Birds - Cornell Lab of ... [PAR] Learn how to identify Sandhill Crane, its life history, cool facts, sounds and calls, 
and ... into a slender neck; the short tail is covered by drooping feathers that form 
a bustle.