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Japanese Transparent Frog
This is one of those truly weird animals. Get this some scientist in Japan at the Institute for Amphibian Biology at Hiroshima University mutant Japanese brown frogs also known as Rena japonica and developed these almost completely transparent frogs. The scientist created these strange animals by combining two types of recessive genes that causes the frogs to be pale.

These transparent frogs are used for research, and enable the scientist to observe how different toxins affect the different organs of the frog without dissecting them. If you look close in the pictures you can even see all of the frogs eggs that it is carrying.