Floris van Breugel / Two Bull Northern Elephant Seals (Mirounga angustirostris) face off before fighting in the middle of the extensive Piedras Blancas rookery with over 150 seals just in this photo, mostly pregnant or nu...

Piper Mackay / Two bull Northern elephant seals (Mirounga langustirostris) fighting in the waves, Pt Piedras Blancas, California, USA

Tim Laman / Red-eyed tree frog (Agalychnis callidryas). Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Jack Dykinga / Clouds forming aroung the jagged summit of Mount Fitz Roy (Chalten) over Piedras Blancas glacier, in Glaciers National Park, Argentina

Tim Fitzharris / Crashing surf on rocks at sunset, Point Piedras Blancas, California

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) males fighting, Point Piedras Blancas, Big Sur, California

Juergen & Christine Sohns / Northern Elephant Seal (Mirounga angustirostris) males facing off, Piedras Blancas, California

Juergen & Christine Sohns / Northern Elephant Seal (Mirounga angustirostris) male, Piedras Blancas, California

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) bulls fighting in surf, Piedras Blancas, California

Jaymi Heimbuch / Northern Elephant Seal (Mirounga angustirostris) male, Piedras Blancas, California

Jaymi Heimbuch / Northern Elephant Seal (Mirounga angustirostris) male calling, Piedras Blancas, San Simeon, California

Jaymi Heimbuch / Northern Elephant Seal (Mirounga angustirostris) males fighting, Piedras Blancas, San Simeon, California

Ingo Arndt / Northern Elephant Seal (Mirounga angustirostris) bull lying in surf, Point Piedras Blancas, California, USA.

Ingo Arndt / Northern Elephant Seal (Mirounga angustirostris) colony at sunset, Point Piedras Blancas, California, USA.

Ingo Arndt / Northern Elephant Seal (Mirounga angustirostris) colony at sunset, Point Piedras Blancas, California, USA.

Ingo Arndt / Tourists watching Northern Elephant Seal (Mirounga angustirostris) colony, Point Piedras Blancas, California, USA.

Doug Perrine / Western gull (Larus occidentalis) adult perched portrait, Piedras Blancas, near San Simeon, California, USA June

Doug Perrine / Northern elephant seal (Mirounga angustirostris) male on the beach for its annual moult, displays ring scars from encircling debris, possibly caused by monofilament fishing net or by packing straps fr...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) large aggressive subadult male exerts its dominance by biting a younger, smaller individual, which howls in protest, while seals are hauled out on the...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) young males sparring, practising for battles for mating rights when they are older, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seals (Mirounga angustirostris) young males sparring, practising for battles for mating rights when they are older, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seals (Mirounga angustirostris) young males sparring, practising for battles for mating rights when they are older, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seal (Mirounga angustirostris) flips sand over its body to protect it from the sun while basking on the beach during its annual moult, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seals (Mirounga angustirostris) young males sparring in the shallows, practising for battles for mating rights when they are older, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seals (Mirounga angustirostris) a large aggressive subadult male (dark) exerts its dominance by climbing onto and biting a younger, smaller individual, Piedras Blancas, California, U...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) mostly young males crowd the beach as they undergo their annual moult, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seals (Mirounga angustirostris) mostly young males crowd the beach as they undergo their annual moult, Piedras Blancas, California, USA June

Doug Perrine / Northern elephant seal (Mirounga angustirostris) fur peels off a seal as it undergoes its annual moult, termed a catastrophic moult, because a layer of skin comes off with the fur and intense hormonal...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) subadult males basking on beach during annual moult, with several showing multiple scars from bites of Cookie cutter sharks and from fights with other...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) bask on the beach during their annual moult - one sleeping seal has his penis extended, Piedras Blancas, California, USA, June

Doug Perrine / Northern elephant seal (Mirounga angustirostris) fur peels off a seal as it undergoes its annual moult, termed a catastrophic moult, because a layer of skin comes off with the fur and intense hormonal...

Doug Perrine / Northern elephant seal (Mirounga angustirostris) fur peels off a seal as it undergoes its annual moult, termed a catastrophic moult, because a layer of skin comes off with the fur and intense hormonal...

Doug Perrine / Northern elephant seals (Mirounga angustirostris) young males sparring in the shallows, practising for battles for mating rights when they are older, Piedras Blancas, California, USA June

Suzi Eszterhas / Northern elephant seal (Mirounga angustirostris) young bulls sparring, Piedras Blancas, California, December.

Suzi Eszterhas / Turkey vulture (Cathartes aura) feeding on deer carcass Piedras Blancas, California, USA.

Suzi Eszterhas / Northern elephant seal (Mirounga angustirostris) pup age five days suckling, Piedras Blancas, California, USA, December.

Suzi Eszterhas / Turkey vulture (Cathartes aura) feeding on deer carcass Piedras Blancas, California, USA.

Suzi Eszterhas / Turkey vulture (Cathartes aura) feeding on deer carcass Piedras Blancas, California, USA.

Gerrit Vyn / Northern elephant seals (Mirounga angustirostris) juveniles fighting. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) vocalizing. Males threaten each other with the snort, a sound caused by expelling air though the proboscis. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) vocalizing. Males threaten each other with the snort, a sound caused by expelling air though the proboscis. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) mature male resting on beach, Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) mature male resting on beach, Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) resting at sunset. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seals (Mirounga angustirostris) on the beach during the pupping and mating season. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) large mature male courting female. Piedras Blancas, California, USA. December.

Gerrit Vyn / Northern elephant seal (Mirounga angustirostris) bull resting on beach, Piedras Blancas, California, USA. December.

Gerrit Vyn / Rocky coast and surf. Piedras Blancas, California, USA. December.

Floris van Breugel / Male Bull Northern Elephant Seals (Mirounga angustirostris) fighting at the Piedras Blancas rookery in California, USA. January.

Floris van Breugel / Northern elephant seal (Mirounga angustirostris) rookery with females nursing pups at sunset, Piedras Blancas, California, USA, January.

Ben Lascelles / Northern Elephant Seal (Mirounga angustirostris) male, Piedras Blancas Elephant Seal Rookery, Big Sur, California, USA, January

Tim Fitzharris / Coastal rocks, Point Piedras Blancas, California

Thomas Marent / Green Climbing Toad (Bufo coniferus), Piedras Blancas National Park, Costa Rica

Tim Fitzharris / Coastal cliffs, Point Piedras Blancas, California

Thomas Marent / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), Piedras Blancas National Park, Costa Rica

Thomas Marent / Tarraco Treefrog (Smilisca phaeota) trio in amplexus, Piedras Blancas National Park, Costa Rica

Thomas Marent / Tarraco Treefrog (Smilisca phaeota) on mushroom, Piedras Blancas National Park, Costa Rica

Thomas Marent / Green Climbing Toad (Bufo coniferus) camouflaged on branch, Piedras Blancas National Park, Costa Rica

Piper Mackay / Two bull Northern elephant seals (Mirounga langustirostris) fighting in the waves, Pt Piedras Blancas, California, USA

Piper Mackay / Male Northern elephant seals (Mirounga langustirostris) in the waves, Pt Piedras Blancas, California, USA

Piper Mackay / Male Northern elephant seal (Mirounga langustirostris)in territorial posture on beach, Pt Piedras Blancas, California, USA

Piper Mackay / Two bull Northern elephant seals (Mirounga langustirostris) fighting in the waves, Pt Piedras Blancas, California, USA

Piper Mackay / Two bull Northern elephant seals (Mirounga langustirostris) fighting in the waves, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) on beach amongst gulls, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) just given birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) giving birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) giving birth to a new pup, Pt Piedras Blancas, California, USA

Piper Mackay / Northern male elephant seal (Mirounga angustirostris) vocalising on the beach, Pt Piedras Blancas, California, USA

Piper Mackay / Pair of Northern elephant seals (Mirounga angustirostris) courtship behaviour in the shallow waves of the beach at Pt Piedras Blancas, California, USA

Piper Mackay / Pair of Northern elephant seals (Mirounga angustirostris) courtship behaviour in the shallow waves of the beach at Pt Piedras Blancas, California, USA

Piper Mackay / Pair of Northern elephant seals (Mirounga angustirostris) courtship behaviour in the shallow waves of the beach at Pt Piedras Blancas, California, USA

Piper Mackay / Pair of Northern elephant seals (Mirounga angustirostris) courtship behaviour in the shallow waves of the beach at Pt Piedras Blancas, California, USA

Piper Mackay / Northern elephant seal (Mirounga angustirostris) vocalisaing to protect her pup, and warn off approaching female, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga langustirostris) with pup, Pt Piedras Blancas, California, USA

Piper Mackay / Male Northern elephant seal (Mirounga angustirostris) resting on the beach alongside female and pup, Pt Piedras Blancas, California, USA

Piper Mackay / Head portrait of male Northern elephant seal (Mirounga angustirostris) vocalising, Pt Piedras Blancas, California, USA

Piper Mackay / Close up of male Northern elephant seal (Mirounga angustirostris) vocalising, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga angustirostris) with pup, Pt Piedras Blancas, California, USA

Piper Mackay / Female Northern elephant seal (Mirounga angustirostris) with pup, Pt Piedras Blancas, California, USA

Piper Mackay / Northern elephant seal (Mirounga angustirostris) female with two pups, Pt Piedras Blancas, California, USA

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) on rookery beach, Piedras Blancas, Big Sur, California

Tim Fitzharris / Pounding waves and rocky shoreline at Piedras Blancas, California

Ingo Arndt / Northern Elephant Seal (Mirounga angustirostris) colony, Point Piedras Blancas, California

Tim Laman / Common tody flycatcher (Todirostrum cinereum) perching on a branch. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Rainforest stream lined with vegetation. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Bromeliad epiphyte growing in rainforest. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Water lily flower. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Red-eyed tree frog (Agalychnis callidryas) on Heliconia plant. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Social flycatcher (Myiozetetes similis) at nest. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Palm leaves (Palmae) in the rainforest. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.

Tim Laman / Flowering water lilies. Piedras Blancas National Park, Esquinas Rainforest Lodge, Costa Rica.