Foraging Ecology of Bald Eagles

SUMMARY:

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.

DATA DESCRIPTION:

The eagles data frame has 8 rows and 5 columns.

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).

SOURCE:

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

EXAMPLES:

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)