Answer:
The Idaho giant salamander is the darkest and most intricately blotched of the giant salamanders.[2] They vary between brown, purple, tan, grey, and a copperish color. Tiger salamanders and Idaho giant salamanders have superficial resemblance pertaining to size and shape, but the costal grooves and foot tubercles are significantly different between the two species. This salamander has a defining thick head and body and a fourth toe on the hind foot with only three segments. Adults are typically 20 cm in length[3] but may vary between 7 and 11.75 inches long, but can be observed around 13 inches.
Explanation:
cite:
https://en.wikipedia.org/wiki/Idaho_giant_salamander
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