[quote=Yog Sothoth]
Summoning techniques do not have anything to do with the environment the ninja is in. You simply just learn the proper technique and summon the creature because I am pretty sure the rain village didn't have rhinos and yet the animal path could summon one.
[/quote]

Yet the second Mizukage had a giant clam, Kisame was basically sharks personified, and their bijuu were a giant turtle and a slug. (F'in Cloud Niggas stole our octo-bull.)

Pain doesn't really represent the rain village as much as he represented the Buddhist Paths of Reincarnation and the Rinnegan itself.

Kishi had to hype up dat divine dojutsu. :lol