Laurent Geslin / Vestal cuckoo bee in flight, Europe

Phil Savoie / Painted nomad bee (Nomada fucata) male with characteristic green eyes, feeding on Dandelion (Taraxacum offinicale) Monmouthshire, Wales, UK. April

Phil Savoie / Painted nomad bee (Nomada fucata) male with characteristic green eyes, sleeping with jaws locked onto grass blade, Monmouthshire, Wales, UK. April

Clay Bolt / Leaf-cutting cuckoo bees (Coelioxys sp) entering the nest of her host, Pickens, South Carolina, USA, May.

Andy Sands / Sharp-tailed bee (Coelioxys conoidea) cleptoparasite of Leaf cutter bee (Megachile maratima) these bees use their sharp tail to slice into the nest of the host leaf cutter bee to lay their eggs inside...

Andy Sands / Gooden's nomad bee (Nomada goodeniana) a cuckoo bee that lays her eggs in the nests of various large Andrena bees, Hertfordshire, England, UK. April

Andy Sands / Cuckoo bee / Nomad bee (Nomada flava) cuckoo bee who lays her eggs in the nests of various andrena bees, Hertfordshire, England, UK, May

Andy Sands / Sharp-tailed bee (Coelioxys conoidea) cleptoparasite of Leaf cutter bee (Megachile maritima). This species uses their sharp tails to slice into the nests of the host leaf cutter bees to lay their egg...

Alex Hyde / Cuckoo bee (Nomada leucophthalma) about to enter the nest burrow of Miner Bee (Andrena clarkella). The cuckoo bee is cleptoparasitic, laying its eggs in nests of other bees in order that their parasit...

MYN / Gil Wizen / Cuckoo bee (Thyreus sp) a cleptoparasite of other species of bees, Central Coastal Plain, Israel, June. meetyourneighbours.net project

MYN / Gil Wizen / Cuckoo bee (Thyreus sp) a cleptoparasite of other species of bees, Central Coastal Plain, Israel, June. meetyourneighbours.net project

Rod Williams / Cuckoo Bee (Bombus vestalis) covered in pollen, on thistle, Lewisham, London, July