Horn Length and Predation Status of Horned Lizards

Squamosal horn length (mm; horn.length) and predation status (group; living or killed) for 184 horned lizards (Phrynosoma mcalli).

Usage

HornedLizards

Format

A data frame with 184 observations on the following 2 variables.

horn.length

a numeric vector

group

a numeric vector

Source

Young, K.V., E.D. Brodie, Jr., and E.D. Brodie, III. 2004. How the horned lizard got its horns. Science 304: 65.

References

http://www.sciencemag.org/cgi/pdf_extract/304/5667/65

Examples

str(HornedLizards)
#> 'data.frame':	185 obs. of  2 variables:
#>  $ horn.length: num  25.2 26.9 26.6 25.6 25.7 25.9 27.3 25.1 30.3 25.6 ...
#>  $ group      : Factor w/ 2 levels "killed","living": 2 2 2 2 2 2 2 2 2 2 ...

histogram(~horn.length | group, HornedLizards,
  layout=c(1,2),
  xlab="Horn Length (mm)")