Juneau has four resident amphibians that breed in fresh water: wood frogs and western (boreal) toads, which have geographic ranges extending way up north, Columbia spotted frogs, which range to about the northern border of Southeast Alaska, and rough-skinned newts, which are at their northern limit in the Juneau area.
These newts (Taricha granulosa) are a west-coast species, from California northward. As the glaciers of the great ice ages retreated, newts apparently expanded their range into coastal British Columbia and then the island archipelago of southern Southeast; not too long ago, in geological time, they reached Admiralty and Shelter Islands. The move to Juneau, probably a few decades ago,
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