GREEN RIVER, Wyo. (AP) -- State wildlife biologists are monitoring a small group of bighorn sheep in a western Wyoming herd for signs of pneumonia.

Wyoming Game and Fish says some of the animals in the Jackson herd recently showed signs of the often-fatal disease. That herd and others in western Wyoming have struggled with outbreaks of the illness over the past decade.

Biologists estimate that up to a half of the roughly 500-member Jackson herd died from pneumonia during the winter of 2001-02.

Tests are being run on samples from two male lambs that were showing symptoms of pneumonia. The lambs were removed from the herd.

Copyright 2010 The AP.

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