first victim – American pika

A small, mountain-dwelling, round-eared relative of the rabbit yesterday became the first mammal that scientists believe has fallen victim to climate change. The American pika, a hamster-sized creature that makes its home among piles of rocks at high altitudes in western America and south-western Canada, has become extinct at nearly one third of sites where it was once common.

A study in the US Journal of Mammology examined 25 sites in the Great Basin, an area between the Sierra Nevada and the Rocky Mountains. It found that pikas had apparently vanished from seven of the locations and blamed climate change.
The Telegraph (UK), 21 Aug 2003

for new category – first victim