Marie Read / Ruby-throated Hummingbird (Archilocus colubris), male flying in to feed from cardinal flowers (Lobelia cardinalis) New York, USA. August.

Melvin Grey / Purple-throated mountain gem (Lampornis calolaemus) adult female - about to feed from flower, Atlantic Rainforest, Costa Rica.

Tim Fitzharris / Ruby-throated Hummingbird (Archilochus colubris) females feeding on flower nectar, Texas

Tim Fitzharris / Ruby-throated Hummingbird (Archilochus colubris) female and Bumblebee (Bombus sp) flying, Arkansas

Kerstin Hinze / Dipper (Cinclus cinclus) foraging in a stream, Harz National Park, Saxony-Anhalt, Germany, March.

Graeme Guy/ BIA / Blue-throated Bee-eater (Merops viridis) pair, Penang, Malaysia

Philippe Clement / European dipper (Cinclus cinclus) perched on rock in stream and looking around, Luxembourg, April.

Philippe Clement / European dipper (Cinclus cinclus) perched on a rock at the base of a waterfall and bobbing, Luxembourg, April.

Agustin Esmoris / White-throated Hummingbird (Leucochloris albicollis) feeding on flower nectar, Argentina

Agustin Esmoris / White-throated Hummingbird (Leucochloris albicollis) feeding on flower nectar, Argentina

Agustin Esmoris / Black-throated Mango (Anthracothorax nigricollis) hummingbird feeding on flower nectar, Argentina

Bence Mate / White-throated Mountain Gem (Lampornis castaneoventris), Green-crowned Brilliant (Heliodoxa jacula) group of three with one in flight, Savegre, Costa Rica