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Measurements
Linear
See Appendix 4 . Males generally larger than females; South American birds tend to be smaller than others; Baja Californian birds tend to be larger than all other subspecies. For E. t. ruficollis: bill 88.9–103.8 mm for males, 87–98 for females. Wing-chord 247–268 mm in males, 204–264 in females. No measurements available for wingspan or total length.
Mass
See Appendix 4 . Few measurements. Mean for males 415 g (ruficollis); range for South American females 213–344 g (n = 8). South American races may be smaller, but this is difficult to tell from mass data.
Frederick, Peter C. 1997. Tricolored Heron (Egretta tricolor), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/306
