falling
today's species evolved from those of the past.
exotic species
Endangered [species]
There are 75 species of Swallows found world wide. 8 of those species are found in Canada and United States.
species
There are 5 different species of cardinal. Within those different species, there are also different variations, such as their coloring, and how they differ from the others.
The alien demanded to know what species Bill was.This is an endangered species.
Organisms in a species have characteristics that differ from those of other organisms in their genus.
Organisms in a species have characteristics that differ from those of other organisms in their genus.
If a predator learns that an insect that looks a certain way (has a certain colour display) stings or is distasteful then it will avoid eating other insects with those colours, even if those insects are of a different species and do not sting or are not distasteful. If those two unrelated insect species have the same predatores, then eventually the individuals that mimic those that sting or are distasteful will leave more descendants than others in their species that do not have those colours and the species will tend to look more and more like those that do.
Those are invasive species.
Endangered species is closer to extinction than threatened ones. Vulnerables species are those that aren't protected and/or isolated.