1348-5363 - Anatomy of the cow digestive apparatus. From left to right: mouth and esophagus, the reticulum (brown excrescence on the left), the rumen or composed paunch, from the top to the bottom by the dorsal sac, the cranial sac and the ventral sac. The grey excrescence beneath is the abomasum or velles.
832-390017 - Eastern giant grey kangaroo (Macropus giganteus), adult, female, mother with young, in pouch, on grassland, social behaviour, Maloney Beach, New South Wales, Australia, Oceania
832-390015 - Eastern grey kangaroo (Macropus giganteus), adult, female, juvenile, looking into pouch, on grassland, Maloney Beach, New South Wales, Australia, Oceania
1287-64 - Fresh avalanche debris on Carn nan Sac, 920m, on the hills above Glenshee ski centre in the Cairngorm National Park, Scotland, United Kingdom, Europe
1256-24 - Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America
1256-23 - Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America
1256-33 - Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America
1256-49 - Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America
739-1369 - Man wearing the traditional Berritta Sardinian hat and carring the traditional double Sardinian sac, St. Antioco celebrations, Sant'Antioco,Sardinia, Italy, Europe
817-426509 - France, Nord-Pas de Calais Region, Nord Department, French Flanders Area, Lille, Palais des Beaux-Arts, art museum, Deux Sacs pour Lille lamps by Gaetano Pesce
832-71289 - Solar collectors for autonomous energy supply to a mountain hut, Velan Hut, Cabane du Velan, of the Swiss Alpine Club, SAC, Valais Alps, Valais, Switzerland, Europe
832-71290 - The futuristic Velan Hut, Cabane du Velan, of the Swiss Alpine Club, SAC, with its six solar panels in front of the summit of Grande Aiguille des Maisons Blanche, Valais, Switzerland, Europe
832-71288 - Velan Hut, Cabane du Velan, of the Swiss Alpine Club, SAC, at the foot of the Grand Combin Mountain, Valais Alps, Valais, Switzerland, Europe
1113-60813 - Male Frigate bird with red gular pouch that is inflated during the breeding season to attract a mate, Heart, Galapagos, Ecuador, South America
857-33139 - A fieldworker sharpens shovels the old fashioned way at the Big Eddy, an Archaeological site on the Sac River in southwestern, MO. Archaeologist Neal Lopinot from Missouri State University has been digging their since 1997 to gain a more complete understanding of the prehistoric record in North America. (Photo by David McLain, Aurora)
1112-134 - Adult male magnificent frigatebird (Fregata magnificens), North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
1112-135 - Adult male magnificent frigatebird (Fregata magnificens), North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
1112-136 - Adult male magnificent frigatebird (Fregata magnificens), North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
930-112 - Juvenile Northern Bottlenose Whale (Hyperoodon ampullatus) lying on the floor of the post mortem room before examination, close up shot of jaws and melon, SAC, Inverness, Scotland.
979-2953 - Adult brown pelican (Pelecanus occidentalis) in the lower Gulf of California (Sea of Cortez), Mexico. Note the yellowish head, red gular pouch, and white neck of the adult.