Puffin with gaping beak, Wales, United Kingdom, Europe

Puffin with gaping beak showing almost parallel articulation, Wales, United Kingdom, Europe

Puffin with gaping beak showing barbs in roof of beak, Wales, United Kingdom, Europe

Fingal's Cave, the hexagonal mouth of the cave with the heather-covered slopes of Mull behind, Argyll and Bute, Scotland, United Kingdom, Europe

Twenty four foot saltwater crocodile (Crocodilus porosus), Hartleys Creek, Queensland, Australia, Pacific

Fantastic sculptures, Villa Orsini, Vierbo Bomarzo, Lazio, Italy, Europe

A gaping hole left where a massive block of ice detached causing an avalanche on Machapuchare (Fishtail Peak) in the Annapurna Himalaya, Nepal, Asia

French Polynesia, Colorful Fishes Of The Lagoon Just Caught

Coral Grouper (Cephalopholis miniata) being cleaned by a BruunÃs Cleaning Partner Shrimp (Urocaridella aontonbruunii) this incredible gaping action allows the shrimp uninhibited access to the mouth and gills.Red Sea.

Ribbon eel (Rhinomuraena quaesita), Atlantis house reef, Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Coral Grouper (Cephalopholis miniata) being cleaned by a BruunÌs Cleaning Partner Shrimp (Urocaridella aontonbruunii) this incredible gaping action allows the shrimp uninhibited access to the mouth and gills. Red Sea.

guillemot, uria aalge, yawning, aberdeenshire, scotland

Coral Grouper (Cephalopholis miniata) being cleaned by a BruunÌs Cleaning Partner Shrimp (Urocaridella aontonbruunii) this incredible gaping action allows the shrimp uninhibited access to the mouth and gills. Red Sea.

Manta ray, Manta birostris, feeding at night, Kailua-Kona, Big Island, Hawaii

Split shot of a Basking Shark (Cetorinus Maximus) in Gunna Sound, Isle of Colll, Scotland. It's mouth is gaping as it feeds. Clouds are lit with the setting sun in the background.

Florida Cottonmouth

Ice floes on the Baltic Sea off Stein, Probstei, Ploen district, Schleswig-Holstein, Germany, Europe

A brown bear (Ursus arctos) about to catch a salmon in its mouth at the top of Brooks Falls, Alaska. The fish is only a few inches away from its gaping jaws. Shot with a Nikon D800 in Alaska; Kodiak, Alaska, United States of America

Yawning Hippopotamus (Hippopotamus Amphibius) At Serengeti National Park, Tanzania

Chum Salmon (Oncorhynchus Keta) Spawning, Underwater View In An Alaskan Stream During Summer.

A Brown Bear (ursus arctos) about to catch a salmon in it's mouth at the top of Brooks Falls, Alaska. The fish is only a few inches away from its gaping jaws. Shot with a Nikon D800 in July 2015, Alaska, United States of America

Australia, The threat display of the frilled lizard (Chlamydosaurus kingii).

Hawaii, Big Island, Kona, manta ray feeds (Manta birostris) front view A86C

Hawaii, Big Island, Kona, Whale Shark (Rhiniodon typus) with mouth wide open