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

Shattil & Rozinski / Broad-tailed hummingbird (Selasphorus platycercus) hovering over Rocky Mountain Irises (Iris missouriensis) flowering in pasture, Wyoming, USA, North America

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

Shattil & Rozinski / Broad tailed hummingbird {Selasphorus platycercus} hovering, USA

Rolf Nussbaumer / Broad-tailed Hummingbird {Selasphorus platycercus} male and female in flight feeding on Musk Thistle (Carduus nutans) Rocky Mountain National Park, Colorado, USA, June

Rolf Nussbaumer / Broad-tailed Hummingbird {Selasphorus platycercus} male in flight feeding on Musk Thistle (Carduus nutans) Rocky Mountain National Park, Colorado, USA, June

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

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 / Broad-tailed Hummingbird (Selasphorus platycercus) feeding on the nectar of a Desert Penstemon (Penstemon pseudospectabilis) flower, New Mexico