Western Tiger Salamander vs. Eastern Tiger Salamander

Until recently one species. A: the Western has bold vertical yellow-to-olive bars or connected bands across the back and sides; the Eastern has rounded, irregular yellow or olive spots that rarely form bars. B: on the Western yellow often dominates, so the animal looks yellow with dark marks; on the Eastern the black or dark brown ground dominates. C: the Western's head is broad, blunt and massive; the Eastern's is narrower, with a slightly more pointed snout. Patterns vary and the two meet in western Minnesota, so range helps: east of the far west it is the Eastern.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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