What may look like glowing eyes are actually organs beneath each eye that are inhabited by symbiotic bioluminescent bacteria. There are eight species of Flashlightfish found in warm seas around the world. Like their relatives, the Orange roughy and the squirrelfish, they are nocturnal animals that retreat to caves beneath reefs in the daytime, and hunt for small animals in shallower water at night.
The 216 species of woodpeckers are found across the Americas, Europe, Asia, and Africa, of which 109 live in Mexico, Central, and South America, and the Caribbean. They are important components of the tropical American ecosystem, as other birds, such as trogons, use the nests they excavate in trees. True to their name, their skulls, beaks and tongues are uniquely adapted to extracting insects from trees. Tropical American woodpeckers are uncommon in zoos, but the DWA has done well with four species: Red-crowned woodpecker (Melanerpes rubricapillus), Puerto Rican woodpecker (Melanerpes portoricensis), Panamanian acorn woodpecker (Melanerpes formicivorus striatipectus) and the Golden-naped woodpecker (Melanerpes chrysauchen).
Very few of the 180 or so caecilian species are easily exhibited in zoos or aquariums, as most live underground. This South American species is an exception, living in water instead. It has been bred in captivity, including the DWA, giving birth to live young. Confined to parts of the Old and Near World Tropics, caecilians compose one of the three orders of amphibians (the other two being frogs and toads, and salamanders). They are the only living amphibians with scales, but these are hidden beneath their skin.