The green-backed firecrown occurs widely in Argentina and Chile, but the Juan Fernández firecrown is found solely on Isla Róbinson Crusoe, one of a three-island archipelago belonging to Chile.
Both species will hang from flower petals or leaves with their feet. They feed on nectar and insects
References
^"Trochilidae". aviansystematics.org. The Trust for Avian Systematics. Retrieved 2023-08-05.
^Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2020). "Hummingbirds". IOC World Bird List Version 10.2. International Ornithologists' Union. Retrieved 2 January 2020.