eagles {MASS}R Documentation

Foraging Ecology of Bald Eagles

Description

Knight and Skagen collected during a field study on the foraging behaviour of wintering Bald Eagles in Washington State, USA data concerning 160 attempts by one (pirating) Bald Eagle to steal a chum salmon from another (feeding) Bald Eagle.

Arguments

y Number of successful attempts.
n Total number of attempts.
P Size of pirating eagle (L = large, S = small).
A Age of pirating eagle (I = immature, A = adult).
V Size of victim eagle (L = large, S = small).

Format

The eagles data frame has 8 rows and 5 columns.

Source

Knight, R. L. and Skagen, S. K. (1988) Agonistic asymmetries and the foraging ecology of Bald Eagles. Ecology, 69, 1188-1194.

Examples

data(eagles)
eagles.glm <- glm(cbind(y, n-y) ~ P*A + V, data=eagles, family=binomial)
dropterm(eagles.glm)
prof <- profile(eagles.glm)
plot(prof)
pairs(prof)


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