He added that hydropower operations , mining and other human activities are additionally taking over caribou habitat .
他还补充道水力发电经营，矿产和其他人类活动正侵占驯鹿的栖息地。
Since the number of moose and caribou is falling , hunters are allowed to shoot the competing wolves from the air .
由于北美驼鹿和驯鹿的数量日益减少，猎人们现在已被允许从空中射杀狼这种竞争对手。
In the summer , caribou migrate from the valleys to high mountain areas where the snow doesn 't melt , seeking refuge from insects .
夏季，驯鹿会从山谷迁移至冰雪不化的高山地带，以山上的昆虫为食。
But predator control of bears is a first in alaska , where bears are hunted for sport but have not been killed to improve hunting of moose or caribou .
The researchers found that the ancient caribou are related to the herds inhabiting the yukon today , while their preserved droppings suggest they had a similar diet .
