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Moving up the animal complexity ladder, Shedd Aquarium will mount “Amphibians” in the temporary exhibit space long occupied by “Jellies,” the institution’s popular exhibition of jellyfish.

Set for a May opening, according to Shedd’s Tuesday announcement, the display of the cold-blooded vertebrates in 30-plus habitats will include minuscule and multi-colored frogs and the world’s second-largest amphibian, a Japanese salamander that reaches almost four feet in length.

“From the surface, amphibians appear to be simplistic animals, but the amazing diversity, adaptations, biologies and behaviors are much more sophisticated – and absolutely fascinating,” Mark Schick, special exhibits collections manager at Shedd, said in the news release.

Shedd is developing the exhibition in-house, and it is scheduled to be up through 2017. (Check out the aquarium’s video preview.) “Jellies” closed in January after an almost four-year run.