(currently writing while in CA)The farthest I've ever been was California (2,779 mi from home) so the most "exotic" animal would be the Black Oystercatchers.
i also photographed a serval there.. hoping to one day see again, stunning animal.Probably a serval in the Serengeti National Park. Probably the rarest of the animals I saw there (not that they are super uncommon to see in the area).