Loss of habitat is to blame, specifically, the lack of the pocket of air between snow and ground called the “subnivean space.” There lemmings winter and give birth to prodigious litters of young.
生
环境
缩小是一个原因，更主要是它们在冰
和地面之间被称
“
空间”里得不到保护，有些旅鼠
在冬天生数量惊人却无法
小旅鼠。
观点；若发现问题，欢迎向我们指正。
