Michael & Patricia Fogden / Caecilian (Gymnophis multiplicata) rainforest, Costa Rica

Piotr Naskrecki / Caecilian (Gymnopis multiplicata), Costa Rica

Daniel Heuclin / Koh Tao caecilian (Ichthyophis kohtaoensis) Thailand.

Daniel Heuclin / Koh Tao caecilian (Ichthyophis kohtaoensis) Thailand.

Daniel Heuclin / Cane toad (Rhinella marina) eating Bearded caecilia (Caecilia tentaculata) French Guiana

Daniel Heuclin / Cane toad (Rhinella marina) eating Bearded caecilia (Caecilia tentaculata) French Guiana

Daniel Heuclin / Cane toad (Rhinella marina) eating Bearded caecilia (Caecilia tentaculata) French Guiana

Daniel Heuclin / Caecilian (Caecilia tentaculata) French Guiana

Daniel Heuclin / Caecilian (Caecilia tentaculata) French Guiana

Michael & Patricia Fogden / Caecilian (Gymnopisámultiplicata), Monteverde Cloud Forest, Costa Rica

Michael & Patricia Fogden / Caecilian (Gymnopisámultiplicata) amid leaf litter on forest floor, Monteverde Cloud Forest, Costa Rica

Pete Oxford / Ringed Caecilian (Siphonops annulatus) on forest floor, Amazon Rainforest, Ecuador

Pete Oxford / Ringed Caecilian (Siphonops annulatus) on forest floor, Amazon Rainforest, Ecuador

Pete Oxford / Ringed Caecilian (Siphonops annulatus) head, Amazon Rainforest, Ecuador

Pete Oxford / Ringed Caecilian (Siphonops annulatus) on forest floor, Amazon Rainforest, Ecuador

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) cloaca, unlike a snake or legless lizard it does not have a tail, its body ends abruptly in a cloaca or excretory cavity, Costa Rica

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) a vertebrate, is almost exclusively subterranean, rarely emerging to the surface, Costa Rica

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) a small bump or chemosensory tentacle sits where the eye should be, serves as a scent organ since their nostrils are closed while burrowing underground, Costa Rica

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) a vertebrate which is almost exclusively subterranean, rarely emerging to the surface, Costa Rica

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) skin detail, a subterranean vertebrate, rarely emerging to the surface, Costa Rica

Michael & Patricia Fogden / Caecilian (Gymnophis multiplicata) rainforest, Costa Rica

Michael & Patricia Fogden / Caecilian (Gymnophis multiplicata) rainforest, Costa Rica

Joel Sartore / Photo Ark / Yellow-striped caecilian (Ichthyophis kohtaoensis) portrait, San Antonio Zoo. Captive, occurs in Southeast Asia.

Joel Sartore / Photo Ark / Yellow-striped caecilian (Ichthyophis kohtaoensis) portrait, San Antonio Zoo. Captive, occurs in Southeast Asia.