Invertebrates are animals without backbones. This simple definition hides the tremendous diversity found within this group which includes protozoa (single-celled animals), corals, sponges, sea urchins, starfish, sand dollars, worms, snails, clams,...

An animal that does not possess a backbone or spinal column. Such creatures as insects and crustaceans are invertebrates. See also: EXOSKELETON;...

Any of the animals without a vertebral column (i.e. a backbone composed of individual vertebrae); not one of the...

Any species of animal lacking a back...

An invertebrate is an animal lacking a spinal column. The group includes 97% of all animal species — all animals except those in the Chordate subphylum Vertebrata (fish, reptiles, amphibians, birds and mammals). Carolus Linnaeus' Systema Naturae...

A British zoo announced Wednesday the virgin birth of five Komodo dragons, giving scientists new hope for the captive breeding of the endangered species.In an evolutionary twist, the newborns' eight-year-old mother Flora shocked staff at Chester Zoo in northern England when she became pregnant without...

Two new invasive species have recently been found along the South Carolina coast _ a massive barnacle that dwarfs those found in the state as well as the Asian green mussel, which reproduces quickly and can pose a threat to floating docks.The barnacle is native...

Ponds that have provided summertime water in the high arctic for thousands of years are drying up as global warming advances, Canadian researchers say. Falling water levels and changes in chemistry in the ponds first were noticed in the 1990s, and by last July some...

Entomologists are debating the origin and rarity of a sprawling spider web that blankets several trees, shrubs and the ground along a 200-yard stretch of trail in a North Texas park.Officials at Lake Tawakoni State Park say the massive mosquito trap is a big attraction...