The Shoebill Stork is one of the worlds more endangered species and is actually considered one of the worlds ugliest animals next to the Wildebeest. People have clearly never delved deeply enough into the species of the sea to think this bird one of the ugliest animals on earth.
The Green (Sea) Turtle is an Endangered Species, even though it is now protected throughout most of the world. Threats to the species include illegal hunting, habitat destruction, pollution, and accidental entanglement in fishing lines. Green Turtle @ Sipadan by lndr, via Flickr