The Martinez beavers are a family of North American beavers (Castor canadensis) living in Alhambra Creek in downtown Martinez, California. Best known as the longtime home of famed 19th/20th-century naturalist John Muir, Martinez is an example of urban stream restoration utilising beavers as ecosystem engineers. The beaver have transformed Alhambra Creek from a trickle into multiple dams and beaver ponds, which in turn, has led to the return of steelhead trout (Oncorhynchus mykiss, river otter (Lontra canadensis), and mink (Neovison vison).
