Guy Edwardes / Little bee-eater (Merops pusillus) vocalising whilst perched on branch, Khwai, Botswana.

Andres M. Dominguez / Bee-eater (Merops apiaster), Sierra de Grazalema Natural Park, southern Spain, July.

Bence Mate / Eurasian bee eater (Merops apiaster) dust bathing in sand, Pusztaszer, Hungary, May.

Bence Mate / European bee eaters (Merops apiaster) one taking off another perched, Kiskunsagi National Park, Pusztaszer, Hungary. May.

Wim van den Heever / White-fronted bee-eaters (Merops bullockoides) perched near to nesting holes Chobe National Park, Botswana.

Wim van den Heever / Little bee eaters (Merops pusillus) two, with one landing on branch with a fly in its beak. Okavango Delta, Botswana

Roger Powell / Pair of European Bee-eater (Merops apiaster) on a bank above their nest hole in front of flowers. Note regurgitated pellets of insect remains. Alentejo, Portugal, April.

Roger Powell / European Bee-eater (Merops apiaster) with a bee landing on a branch by its mate. Alentejo, Portugal, May.

Roger Powell / European Bee-eater (Merops apiaster) courting a female by offering her a Small Copper butterfly (Lycaena phlaeas). Alentejo, Portugal, April.

Richard Du Toit / Burchell's Zebra (Equus burchellii) and Carmine Bee-eater (Merops nubicus) as passenger, Savuti, Chobe National Park, Botswana

Graeme Guy/ BIA / Chestnut-headed Bee-eater (Merops leschenaulti) trio with insect prey, Penang, Malaysia

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

Thomas Hinsche/ BIA / European Bee-eater (Merops apiaster) pair squabbling, Saxony-Anhalt, Germany

Thomas Hinsche/ BIA / European Bee-eater (Merops apiaster) pair, Saxony-Anhalt, Germany

Graeme Guy / Chestnut-headed Bee-eater (Merops leschenaulti) male, Penang, Malaysia

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

Konrad Wothe / European Bee-eater (Merops apiaster) presents prey item to potential mate, Bulgaria

Konrad Wothe / European Bee-eater (Merops apiaster) trio calling, Bulgaria

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Hermann Brehm / Bee-eater (Merops apiaster) pair, near nest on flat ground, rather than on sandy banks, Hungary

Hermann Brehm / Bee-eater (Merops apiaster), nesting on flat ground, rather than in sand bank, Hungary

Hermann Brehm / Bee-eater (Merops apiaster), with dragonfly prey, Hungary

Hermann Brehm / Bee-eater (Merops apiaster), with dragonfly, Hungary

Hermann Brehm / Bee-eater (Merops apiaster), nesting on flat ground, rather than in sand bank, Hungary

Hermann Brehm / Bee-eater (Merops apiaster), nesting on flat ground, rather than in sand bank, Hungary

Hermann Brehm / Three Bee-eaters (Merops apiaster) perched, two with insect prey, Hungary

Hermann Brehm / Four Bee-eaters (Merops apiaster) perched on branch, each with insect prey in beak, Hungary

Hermann Brehm / Bee-eater (Merops apiaster),flying near nest -on flat ground, rather than in sand bank, Hungary

Guy Edwardes / Little bee-eater (Merops pusillus) pair catching bee, perched on branch. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Little bee-eater (Merops pusillus) pair perched on branch, looking in same direction. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Swallow-tailed bee-eater (Merops hiundineus) perched on branch. Savuti, Botswana.

Guy Edwardes / Swallow-tailed bee-eater (Merops hiundineus) with open beak, perched on branch. Savuti, Botswana.

Guy Edwardes / Little bee-eater (Merops pusillus) perched on Reed. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Southern carmine bee-eater (Merops nubicoides) perched on branch. Chobe National Park, Botswana.

Guy Edwardes / Southern carmine bee-eater (Merops nubicoides) perched on branch. Chobe National Park, Botswana.

Guy Edwardes / Southern carmine bee-eater (Merops nubicoides) pair perched on branch, looking in opposite directions. Chobe National Park, Botswana.

Guy Edwardes / Southern carmine bee-eater (Merops nubicoides) perched in Camelthorn (Vachellia erioloba) tree, seedpod on branch below. Chobe National Park, Botswana.

Guy Edwardes / Southern carmine bee-eater (Merops nubicoides) perched on branch. Chobe National Park, Botswana.

Guy Edwardes / White-fronted bee-eater (Merops bullockoides) in flight. Chobe River, Chobe National Park, Botswana.

Guy Edwardes / White-fronted bee-eater (Merops bullockoides) at nesting cliff. Chobe River, Chobe National Park, Botswana.

David Perpinan / Male European bee-eater (Merops apiaster) transferring prey to female, Cuenca, Spain, June.

David Perpinan / European bee-eater (Merops apiaster) preening on perch, Cuenca, Spain, June.

David Perpinan / Pair of European bee-eater (Merops apiaster) sharing prey, Cuenca, Spain, June.

David Perpinan / Male European bee-eater (Merops apiaster) lands with insect, transfers it to female before flying away, Cuenca, Spain, June.

David Perpinan / European bee-eater (Merops apiaster) preening, Cuenca, Spain, June.

David Perpinan / Pair of European bee-eater (Merops apiaster) mating on perch, Cuenca, Spain, June.

David Perpinan / Male European bee-eater (Merops apiaster) leaving perch, capturing insect and then offering it to female, Cuenca, Spain, June.

David Perpinan / Male European bee-eater (Merops apiaster) killing insect and transferring to female, Cuenca, Spain, June.