The past decades, animal welfare has become a very important part of any zoo (as it should be). However, it's very clear that not every group get's the attention it deserves. Whilst large mammals are often subjected to strict standards, reptiles, amphibians, fish and inverts often are somewhat...
A Haitian giant galliwasp (Celestus warreni); after being off-show for years, they now share an enclosure with the Plumed basilisks (Basiliscus plumifrons). A shy species, they spend most of their time hiding. I'm not sure how many are on display.