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42 Topic Pages Found in Biology and starting with the letter R
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Open Rabies

Viral disease of the brain and central nervous system that can afflict all mammals. The rabies virus belongs to the lyssavirus group of viruses.


nocturnal New World mammal of the genus Procyon. The common raccoon of North America, Procyon lotor, also called coon, is found from S Canada to South

Open Radishes

( see also DAIKON ) Technically referring to any of a number of plants belonging to the genus Raphanus and the mustard family, the term “radish” is

Open rainforest

Dense forest usually found on or near the Equator where the climate is hot and wet. There are two types of rainforest, tropical and temperate,

Ramón y Cajal, Santiago (1852 - 1934)

Place : Spain Subject : biography, biology Spanish histologist whose research revealed that the nervous system is based on units of nerve cells

Open Raspberries

( see also BERRIES ) A number of shrublike, prickly plants of the genus Rubus have fruits that we call raspberries. Among them are R. strigosus (= R.


name applied to various stout-bodied rodents , usually having a pointed muzzle, long slender tail, and dexterous forepaws. It refers particularly to

Open ratite

( răt'ìt ), common and general term for a variety of flightless birds characterized by a flat, raftlike sternum rather than the keeled sternum,

Open rattlesnake

poisonous New World snake of the pit viper family, distinguished by a rattle at the end of the tail. The head is triangular, being widened at the

Open Rays (Fishes)
Rays (Fishes)

extremely flat-bodied cartilaginous marine fish , related to the shark . The pectoral fins of most rays are developed into broad, flat, winglike