From: "The Herons Handbook" by James Hancock and James Kushlan, page 26:

Egretta alba alba, from Europe and temperate Asis, has variable colored tibia and tarsus.

Egretta alba egretta, from North and South America, has all black legs.

Egretta alba modesta, from Asia and Australasia, has variable tibia and tarsus, except during courtship.





Ken Knittle
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