Alarm Calls in Chickadees

Number of "dee" notes per call in Black-capped Chickadees (Poecile atricapilla) for 13 predator species with differing body masses.

Usage

Chickadees

Format

A data frame with 13 observations on the following 3 variables.

species

a character vector

mass

a numeric vector

dees

a numeric vector

Source

Templeton, C.N., E. Greene, and K. Davis. 2005. Allometry of alarm calls: Black-capped Chickadees encode information about predator size. Science 308: 1934-1937.

References

http://www.sciencemag.org/cgi/content/short/308/5730/1934

Examples

str(Chickadees)
#> 'data.frame':	13 obs. of  3 variables:
#>  $ species: Factor w/ 13 levels " American kestrel",..: 7 12 1 6 13 2 9 8 4 11 ...
#>  $ mass   : num  0.07 0.08 0.12 0.19 0.35 0.45 0.72 0.72 1.4 0.99 ...
#>  $ dees   : num  3.95 4.08 2.75 3.03 2.27 3.16 2.19 2.8 2.45 1.33 ...
Chickadees
#>                species mass dees
#> 1   Northern pygmy-owl 0.07 3.95
#> 2         Saw-whet owl 0.08 4.08
#> 3     American kestrel 0.12 2.75
#> 4               Merlin 0.19 3.03
#> 5      Short-eared owl 0.35 2.27
#> 6         Coopers hawk 0.45 3.16
#> 7       Prairie falcon 0.72 2.19
#> 8     Peregrine falcon 0.72 2.80
#> 9     Great horned owl 1.40 2.45
#> 10   Rough-legged hawk 0.99 1.33
#> 11           Gyrfalcon 1.40 2.24
#> 12     Red-tailed hawk 1.08 2.56
#> 13      Great gray owl 1.08 2.06

xyplot(dees ~ mass, data = Chickadees,
   xlab = "Predator body mass (kg)",
   ylab = "'Dees' per call", type=c('p','r')
)