Pacific pocket mouse

North America


Perognathus longimembris pacificus


  • Habitat loss
  • Infrastructure development
  • Man-made activities

The Pacific Pocket Mouse, an endemic rodent species to California, is considered as the smallest of its kind in North America. Adults only weigh up to seven grams (about the equivalent of three pennies) even though its body is covered in thick silky-soft fur.

It lives in the woodland forests of the Los Angeles county, requiring fine-grained substrates, blow-sand, and groundwater to create complex underground burrows as shelter.

Most of the areas where the Pacific Pocket Mouse lives have already experienced severe damage and degradation due to the need to turn the land into residential settlements and recreational facilities or for agricultural purposes. The constant ground disturbances and vegetation removal to make way for infrastructure development contribute to the rapid decline of this rodent creature.

Because of these activities, its natural range becomes more open to invasive plant species, predatory animals, illegal trash dumping, and vehicle threats – all of which threaten the survival and population growth of the Pacific Pocket Mouse.