A species is difficult to define exactly, as there are disagreements among biologists on the exactly what a species is. Basically, a species is a 'type' of animal. Domestic cats, humans, wolves (which include domestic dogs), African elephants etc. are all different species. Birds, cats, monkeys etc. are not species, because they include multiple species. Technically, 'species' is a taxonomic ranking: http://en.wikipedia.org/wiki/Species Sometimes the word 'species' is used in technical contexts to mean 'type'. An individual is a single entity. I am an individual, you are an individual. Both of us make two individuals.

A species is a type of plant or animal, for instance Rose, or Bottlenose dolphin. An individual is a particular member of a species, for instance George Smith or Skippy the Kangaroo.

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According to my lecture notes, there are the three main species definitions: 1) Typological species: Species are defined as things which look different from one another. This was the original species definition, but has been heavily criticised for being extremely subjective. 2) Biological species: "Species are groups of actually or potentially interbreeding populations, which are reproductively isolated from other such groups." This definition cannot be applied to fossils, groups separated by large distances, asexual organisms or species hybrids. 3) Phylogenetic species