ruminant mammal of the family Cervidae, found in most parts of the world except Australia. Antlers, solid bony outgrowths of the skull, develop in the
or woodhewer, common names for woodpeckerlike birds of tropical forest and brush, constituting about 50 species in the family Dendrocolaptidae.
Diabetes mellitus, often referred to simply as diabetes, is not a single disease but a group of metabolic disorders characterized by hyperglycemia
This year, over one billion people around the world will suffer from diarrhea. The disease is particularly prevalent in the developing world, where a
( dì'ətŏm´´, –tōm´´ ), unicellular organism of the kingdom Protista , characterized by a silica shell of often intricate and beautiful sculpturing.
A wild dog that was introduced to Australia thousands of years ago, considered responsible for the extinction of many large marsupials on the
Any extinct carnivorous or herbivorous reptile belonging to the predominantly terrestrial orders Saurischia or Ornithischia that existed during the
name for a number of small sharks of several different families. Best known are the spiny dogfishes (family Squalidae) and the smooth dogfishes
DOGS HAVE BEEN human companions at least since the Mesolithic era, some 20,000 years ago. Oddly, whenever they are successfully trained by humans to
Any of various highly intelligent aquatic mammals of the family Delphinidae, which also includes porpoises. There are about 60 species. Most inhabit