Donald M. Jones / Rufous Hummingbird (Selasphorus rufus) female feeding on flower nectar, Montana

Tim Zurowski / Rufous Hummingbird (Selasphorus rufus) female feeding on flower nectar, British Columbia, Canada

Diane McAllister / Rufous hummingbird (Selasphorus rufus) drinking nectar from an Agastache bloom in a backyard in Reno. Nevada, USA, August

Donald M. Jones / Rufous Hummingbird (Selasphorus rufus) male sitting on willow branch, Troy, Montana

Tom Vezo / Rufous Hummingbird (Selasphorus rufus) male feeding at flower, Green Valley, Arizona

Michael & Patricia Fogden / Eyelash Viper (Bothriechis schlegelii) gold morph lying in wait on Heliconia (Heliconia imbricata) to strike at Rufous-tailed Hummingbird (Amazilia tzacatl) rainforest, Costa Rica

Michael & Patricia Fogden / Rufous-tailed Hummingbird (Amazilia tzacatl) feeding on Hamelia flowers, Costa Rica

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) juvenile feeding on flowers, New Mexico

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) feeding on flowers, New Mexico

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) feeding on the nectar of a Desert Figwort (Scrophularia desertorum), New Mexico

Ingo Arndt / Rufous-tailed hummingbird (Amazilia tzacatl) nectaring on flower. Western slope of Andes, Ecuador. October.

John Shaw / Rufous-tailed hummingbird (Amazilia tzacatl) with heliconia plants adding color in the background. San Jose, Costa Rica, December.