Endangered and Threatened Species

Frequency of taxon groups on the U.S. Fish and Wildlife Service list of endangered and threatened species (2002).

Usage

EndangeredSpecies

Format

A data frame with 11 observations on the following 2 variables.

taxon

a character vector

num.species

a numeric vector

Source

U.S. Fish and Wildlife Service. 2001. Number of U.S. listed species per calendar year.

References

http://www.fws.gov/endangered/

Examples

str(EndangeredSpecies)
#> 'data.frame':	11 obs. of  2 variables:
#>  $ taxon      : Factor w/ 11 levels "Amphibians","Arachnids",..: 8 3 10 1 6 5 11 7 2 4 ...
#>  $ num.species: int  74 92 36 22 115 21 32 44 12 70 ...
EndangeredSpecies
#>          taxon num.species
#> 1      Mammals          74
#> 2        Birds          92
#> 3     Reptiles          36
#> 4   Amphibians          22
#> 5         Fish         115
#> 6  Crustaceans          21
#> 7       Snails          32
#> 8      Insects          44
#> 9    Arachnids          12
#> 10       Clams          70
#> 11      Plants         745