Green Thorntail primarily forages in the canopy. The flight while hovering is "very quiet [and] steady, with tail held cocked up at nearly a right angle" (Stiles and Skutch 1989). Hilty and Brown (1986) describe the flight as "weaving and beelike".
Captures small flying insects by hawking (Stiles and Skutch 1989), and also regularly "hovers to glean from the undersurface of larger canopy leaves" (Hilty and Brown 1986).
Undescribed. Green Thorntail presumably is polygynous, as are most if not all species of hummingbirds (Schuchmann 1999: 509).
"Breeding males perch on high bare twigs [and] sometimes give dive displays" (Stiles and Skutch 1989).
Social and interspecific behavior
Green Thorntail often is solitary, but can be "numerous" in aggregations at tall flowering trees (Hilty and Brown 1986).
No reports of predation on Green Thorntail?