Espen Bergersen / Aerial shot of three Humpback whales (Megaptera novaeangliae) swimming into a shoal of Atlantic herring (Clupea harengus), preparing to lunge feed, Troms, Norway, January.

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) male on a Hibiscus flower to feed, Rollingstone Beach, North Queensland, Australia. September.

Neil Aldridge / Five orphaned White rhinoceros (Ceratotherium simum) calves feed from a trough at dusk at the Rhino Revolution orphanage near Hoedspruit, South Africa.

Neil Aldridge / Orphaned White rhinoceros (Ceratotherium simum) calves feed from a trough at dusk at the Rhino Revolution orphanage near Hoedspruit, South Africa. The mothers of these rhinos were killed by poachers f...

Neil Aldridge / A young White rhinoceros (Ceratotherium simum) and its mother feed on grassland on Kariega Game Reserve, South Africa.

Neil Aldridge / Two Black rhinoceros (Diceros bicornis) feed on bushes in Okavango Delta, Botswana, while Yellowbilled oxpeckers (Buphagus africanus) feeding on parasites on their skins. These rhinos were released in...

Marie Read / Tricolored heron (Egretta tricolor) adult in breeding plumage capturing fish by half-running half-flying across water's surface and stabbing with its bill, Viera Wetlands, Brevard County, Florida,...

Marie Read / White-winged Crossbill (Loxia leucoptera), male feeding on Douglas-fir cones, Ithaca, New York, USA, January.

Marie Read / Avian feeding frenzy with a flock of White Pelicans (Pelecanus erythrorhynchos) swimming along a channel chasing school of fish. A mixed flock of long-legged waders, including Great Egrets (Ardea alba...

Marie Read / Backyard setup for photographing Ruby-throated Hummingbirds (Archilocus colubris) in summer, New York, USA. A medical syringe is used to inject a few drops of sugar solution into the flower (set up in...

Marie Read / Spotted sandpiper (Actitis macularius), with head submerged as it jabs at underwater prey, Caroline, New York, USA, May.

Marie Read / California Gull (Larus californicus), foraging for alkali flies (Ephydra hians) by running through swarm snapping its bill, on the shore at Mono Lake, California, USA. Digital frame expansion.

Alex Hyde / Harvestman (Leiobunum sp.) Triglav National Park, Julian Alps, Slovenia, July.

Joao Burini / Gagrellinae harvestman. South-east atlantic forest, Tapirai, Sao Paulo, Brazil.

Rod Williams / Harvestmen (Leiobunum rotundum) a group of three females and a male, Brockley Cemetery, Lewisham, London, England, UK. July.

Chris Mattison / Harvestman spider (Leiobunum rotundum), on wall, Catbrook, Monmouthsire, Wales, UK, July

James Dunbar / Pair of Harvestmen (Leiobunum rotundum) mating on a flower, England, UK, September.

James Dunbar / Pair of Harvestmen (Leiobunum rotundum) mating, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) grooming, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) grooming, England, UK, September.

James Dunbar / Female Harvestman (Leiobunum rotundum) feeding on a fly, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) courting a female, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) biting the leg of another male, competing to mate with a female, Bristol, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) chasing a female and attempting to force mate with her, Bristol, England, UK, September.

James Dunbar / Male Harvestman (Leiobunum rotundum) chasing a female and attempting to force mate with her, Bristol, England, UK, September.

James Dunbar / Panning shot of two male Harvestmen (Leiobunum rotundum) fighting over a mate, Bristol, England, UK, September.

James Dunbar / Two male Harvestmen (Leiobunum rotundum) fighting over a mate, Bristol, England, UK, September.

James Dunbar / Two male Harvestmen (Leiobunum rotundum) fighting over a mate, Bristol, England, UK, September.

James Dunbar / Two male Harvestmen (Leiobunum rotundum) fighting over a mate, Bristol, England, UK, September.

James Dunbar / Harvestmen (Leiobunum rotundum) mating in a Eupatorium (Eupatorium) flower, England, UK, September.

James Dunbar / Two male Harvestmen (leiobunum rotundum) fighting over a female, Bristol, England, UK, September.

Laurent Geslin / Harvestman (Leiobunum rotundum) in urban environment, Grenoble, France, September.

Philippe Clement / Female Harvestman (Leiobunum rotundum) on leaf in bush, La Brenne, France, June.

Stephen Dalton / Harvestman (Leiobunum rotundum) on leaf, Sussex, England, UK. August.

John Abbott / Harvestman (Eumesosoma sp.) Navasota, Cat's Cradle Cat Rescue, Grimes County, Texas, USA.

Rod Williams / Harvestman (Leiobunum rotundum) Brockley cemetery, Lewisham, England, UK, October.

Nick Upton / Portrait of female Harvestman (Leiobunum rotundum). Wiltshire garden, UK, September.

Ingo Arndt / Harvestman (Leiobunum sp) mass, Germany

Ingo Arndt / Harvestman (Leiobunum sp) group, an introduced and invasive species, Germany

Ingo Arndt / Harvestman (Leiobunum sp) group, an introduced and invasive species, Germany

Ingo Arndt / Harvestman (Leiobunum sp), introduced and invasive species, Germany

Ingo Arndt / Harvestman (Leiobunum sp) group, an introduced and invasive species, Germany

Doug Wechsler / Harvestmen (Leiobunum sp.) mating pair, Evansburg State Park, Pennsylvania, USA. August.

Doug Wechsler / Harvestmen (Leiobunum sp.) mating pair, Evansburg State Park, Pennsylvania, USA. August.

Doug Wechsler / Harvestman (Leiobunum sp.) infected by fungus (Pandora phalangicida) that parasitizes Opiliones arachnids. Philadelphia, Pennsylvania, USA. July.

Nigel Cattlin / North European harvestman (Leiobunum rotundum) waiting in the branch of a greenhouse cucumber (Cucumis sativus) plant, Berkshire, July.

Joao Burini / Harvestman (Gagrellinae) Southeastern Atlantic Forest, Mantiqueira Mountain Range, Sao Francisco Xavier, Sao Paulo, Brazil.

Joao Burini / Harvestman (Gagrellinae) Southeastern Atlantic Forest, Mantiqueira Mountain Range, Sao Francisco Xavier, Sao Paulo, Brazil.

Joao Burini / Flatworm (Geoplaninae) preying on Harvestman (Gagrellinae) Southeastern Atlantic Forest, Mantiqueira Mountain Range, Sao Francisco Xavier, Sao Paulo, Brazil.