I'm curious about Pathfinder's shaman class, but I'm unsure about what animals I'm allowed to have as a spirit animal. The book says that the spirit animal aspect uses the Arcane Bond rules, but does that mean I'm limited to only what's in the list of familiars? Or is it the same list as the animal companions for, say, a druid or ranger? Thanks for your help!
Since it uses the Arcane Bond rules, that would mean you are limited to the choices for Familiars. If you were allowed to use Animal Companions, there would be wording more like Rangers' Hunter's Bond or the Hunter's Animal Companion:
This ability functions like the druid animal companion ability (which is part of the Nature Bond class feature)