Ingo Arndt / Northern elephant seal {Mirounga angustirostris} male sleeping, California

Ingo Arndt / Two Northern elephant seal (Mirounga angustirostris) males fighting for dominance, California, USA

Ingo Arndt / Northern elephant seal male on seashore {Mirounga angustirostris} California, USA

Ingo Arndt / Northern elephant seal male {Mirounga angustirostris} close-up of head and proboscis. California, USA

Sean Crane / Northern Elephant Seal (Mirounga angustirostris) male calling in territoral display with breath visible, San Simeon, California

Chien Lee / Northern Elephant Seal (Mirounga angustirostris) juveniles sleeping, California

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...

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) weaner / juvenile head portrait, with head turned to look at camera, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, Febr...

Claudio Contreras / Pair of Northern elephant seals (Mirounga angustirostris) male holding female during copulation, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) colony on beach, with juvenile / weaner in the surf, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) close-up of weaner / juvenile sleeping, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) weaner sleeping at the bottom of a tide pool, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April