bear {asbio}

Grizzly bear litter sizes

Description

Counts of grizzly bear (Ursus arctos) litter sizes from the Greater Yellowstone Ecosystem from 1973-2010.

Usage

data(bear)

Format

A data frame with 38 observations on the following 5 variables.

Year

Year.

X1.cub

The number of litters with one cub.

X2.cub

The number of litters with two cubs.

X3.cub

The number of litters with three cubs.

X4.cub

The number of litters with four cubs.

Source

Haroldson, M. A (2010) Assessing trend and estimating population size from counts of unduplicated females. Pgs 10-15 in Schwartz, C. C., Haroldson, M. A., and K. West editors. Yellowstone grizzly bear investigations: annual report of the Interagency grizzly bear study team, 2010. U. S. Geological Survey, Bozeman, MT.