Nick Upton / Harvest mouse (Micromys minutus) cleaning its nose on Common hogweed (Heracleum sphondylium) flowerhead after release, Moulton, Northampton, UK, June.

Nick Upton / Pair of White storks (Ciconia ciconia) mating on their nest, Knepp Castle Estate, Sussex, England, UK, April. This is the first recorded instance of White storks nesting in the UK for several hundreds...

Nick Upton / Pair of White storks (Ciconia ciconia) arranging nest material on their nest, Knepp Castle Estate, Sussex, England, UK, April. This is the first recorded instance of White storks nesting in the UK for...

Nick Upton / Pair of White storks (Ciconia ciconia) arranging nest material on their nest, Knepp Castle Estate, Sussex, England, UK, April. This is the first recorded instance of White storks nesting in the UK for...

Nick Upton / Red mason bees (Osmia bicornis) entering and leaving nest hole drilled into a log within an insect hotel, Gloucestershire, England, UK, April.

Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.

Nick Upton / Two Red fox (Vulpes vulpes) cubs playing near the entrance to their den at dusk, Somerset, England, UK, May.

Nick Upton / European eel (Anguilla anguilla) elver migrating upstream, using an eel pass on the side of a weir, Somerset Levels, England, UK, July.

Nick Upton / Male Eurasian beaver (Castor fiber) grazing at dusk, River Otter, Devon, England, UK, June.

Nick Upton / Tilt shot of a dam constructed by Eurasian beavers (Castor fiber) on a section of the River Otter, Devon, England, UK, June 2018.

Nick Upton / Common swifts (Apus apus) flying overhead, Wiltshire, UK, June. Digital composite image.

Nick Upton / Common swift (Apus apus) feeding chick in a nest box, filmed using infrared light, Cambridge, England, UK, August.

Nick Upton / Eurasian beaver (Castor fiber) adding a branch to its dam, Tayside, Scotland, UK, May. Filmed at night using a remote camera and infra red light.

Nick Upton / Female Eurasian beaver (Castor fiber) and five kits feeding on a Willow (Salix) sapling, River Otter, Devon, England, UK, July. Part of Devon Wildlife Trust's Devon Beaver Trial.

Nick Upton / Rescued Grey seal pup (Halichoerus grypus) in a convalescence pool where it will be kept until strong enough to be released back to the sea, Cornish Seal Sanctuary, Gweek, Cornwall, UK, January.

Nick Upton / Blind adult male Grey seal (Halichoerus grypus) 'Marlin' waving a flipper at the edge of a convalescence pool where he is a long-term resident, Cornish Seal Sanctuary, Gweek, Cornwall, UK, January. Mo...

Nick Upton / Adult female Common / Harbour seal (Phoca vitulina) 'Sija' waving a flipper in a pool where she is a long-term resident, Cornish Seal Sanctuary, Gweek, Cornwall, UK, January.

Nick Upton / Two Eurasian beaver kits (Castor fiber) feeding at night, born in the wild on the River Otter as part of the River Otter Beaver Trial, Devon, England, UK, August 2015.

Nick Upton / Mute swan (Cygnus olor) female and a young cygnet foraging in sunset light, Kennet and Avon canal, Caen Hill, Wiltshire, UK, June.

Nick Upton / Harvest mouse (Micromys minutus) on Common hogweed (Heracleum sphondylium) flowerhead after release, Moulton, Northampton, UK, June.

Nick Upton / Harvest mouse (Micromys minutus) on Common hogweed (Heracleum sphondylium) flowerhead after release, Moulton, Northampton, UK, June.

Nick Upton / Adult Herring gull (Larus argentatus) scavenging left over food, St.Ives, Cornwall, UK, June. Editorial use only.

Nick Upton / Adult Herring gull (Larus argentatus) walking among sunbathers on beach, St.Ives, Cornwall, UK, June. Editorial use only.

Nick Upton / Male Eurasian beaver (Castor fiber) at night, feeding on a branch in a pond, Devon Wildlife Trust's Devon Beaver Project, Devon, UK, April.

Nick Upton / Male Eurasian beaver (Castor fiber) at night, feeding on a branch in a pond, Devon Wildlife Trust's Devon Beaver Project, Devon, UK, April.

Nick Upton / Eurasian beaver (Castor fiber) gnawing the trunk of a Willow tree (Salix sp.) in woodland enclosure at night. Devon Beaver Project, run by Devon Wildlife Trust, Devon, UK, April. Taken by a remote cam...

Nick Upton / Julia Coats of the Animal and Plant Health Agency releasing Eurasian beaver (Castor fiber) back into River Otter. Part of escaped population re-released to the wild following veterinary check ups. Tak...

Nick Upton / Eurasian beaver (Castor fiber) entering the River Otter after release. Part of escaped population re-released to the wild following veterinary check ups. Taken on the second day of Beaver releases aft...

Nick Upton / Eurasian beaver (Castor fiber) at night, swimming, Devon Wildlife TrustÕs Devon Beaver Project enclosure, Devon, England, UK, March.

Nick Upton / Eurasian beaver (Castor fiber) at night, chewing bark and climbing along a felled tree, Devon Wildlife TrustÕs Devon Beaver Project enclosure, Devon, England, UK, March.

Nick Upton / Common starfish (Asterias rubens) moving in a rockpool, real time, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) and a Rock goby (Gobius paganellus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Rock goby (Gobius paganellus) stealing food from a scavenging Common prawn (Palaemon serratus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Slow motion clip of a Meadow brown butterfly (Maniola jurtina) and a Gatekeeper butterfly (Pyronia tithonus) nectaring on Saw-wort flowers (Serratula tinctoria), with a Silver-washed fritillary (Argyn...

Nick Upton / Close up view of a Marbled white butterfly (Melanargia galathea) nectaring on a Field scabious (Knautia arvensis) flower, with another trying to court with it, Wiltshire, England, UK, July.

Nick Upton / Slow motion cllip of a Marbled white butterfly (Melanargia galathea) nectaring on a Creeping thistle (Cirsium arvense) flower, with another trying to court with it, Wiltshire, England, UK, July.

Nick Upton / Little egret (Egretta garzetta) struggling to swallow a large Pike (Esox lucius) it has just caught, Rutland Water, Rutland, England, UK, November.

Nick Upton / Flock of Jackdaws (Corvus mondedula) taking off from their roost site, Gloucestershire, England, UK, December.

Nick Upton / Close-up of a Dark green fritillary (Argynnis aglaja) nectaring on a Greater knapweed (Centaurea scabiosa) flower and flying off, Wiltshire, England, UK, July.

Nick Upton / Eurasian beaver (Castor fiber) feeding on grass amongst Meadow buttercups (Ranunculus acris) near a pond in a large enclosure, Devon, England, UK, June. Captive.

Nick Upton / Panning shot of partially flooded pastureland with large flocks of Wigeon (Anas penelope), Lapwings (Vanellus vanellus) and Golden plover (Pluvialis apricaria) in flight, Gloucestershire, England, UK,...

Nick Upton / Grey seal (Halichoerus grypus) pup aged one month, rubbing its head with its flipper, yawning and settling down to rest on a sandy beach, Norfolk, England, UK, January.

Nick Upton / Panning shot of a flock of Lapwings (Vanellus vanellus) landing on partially flooded pastureland near resting Black-tailed godwits (Limosa limosa) and grazing Wigeon (Anas penelope), Gloucestershire,...

Nick Upton / Flock of Lapwings (Vanellus vanellus) in flight, with Golden plover (Pluvialis apricaria) flying in the background, Gloucestershire, England, UK, January.

Nick Upton / Dewpond on the Ridgeway, recently renovated and relined by the Marlborough Downs Nature Improvement Area project, Winterbourne Bassett, Wiltshire, UK, March.

Nick Upton / Bloody-nosed beetles (Timarcha tenebricosa) mating on a grass stem in a chalk grassland meadow, Wiltshire, UK, April.

Nick Upton / Grey seal (Halichoerus grypus) pup resting on a sandy beach, stretching and rubbing its head with its flipper, Norfolk, England, UK, January.

Nick Upton / Pollen and nectar flower mix strip with Mustard (Brassicaceae), Common sainfoin (Onobrychis viciifolia) and Red clover (Trifolium pratense) bordering a Barley crop (Hordeum vulgare), Marlborough Downs...