swallows: Orientation of juvenile barn swallows

Description Usage Format Source Examples

Description

The _swallows_ dataset has 114 rows and 2 columns. The observations are the headings of juvenile barn swallows (_Hirundo rustica_) tested in orientation cages (Emlen funnels) during autumn migration under simulated overcast conditions.

Usage

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Format

A data frame with 114 observations on the following 2 variables.

treatment

a factor with levels control (control group: local magnetic field) and shifted (shifted magnetic field, magnetic North = geographical West)

heading

a numeric vector: modal heading of each bird

Source

Giunchi, D., and Baldaccini N. E. (2004) Orientation of juvenile barn swallows (Hirundo rustica) tested in Emlen funnels during autumn migration. Behav. Ecol. Sociobiol. (56):124-131.

Examples

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data(swallows)

swallows <- split(swallows$heading, swallows$treatment)
swallows <- lapply(swallows, function(x) circular(x, units='degrees', template='geographics'))

plot(swallows[[1]])
points(swallows[[2]], col=2)
legend('topright', legend=c('control', 'shifted'), pch=c(19,19), col=c(1,2))

Example output

Attaching package:circularThe following objects are masked frompackage:stats:

    sd, var

circular documentation built on May 1, 2019, 7:57 p.m.