Scaling moist heights: Sirajo goby, or olivo, is a Puerto Rico stream fish with suction-cup pelvic fins that allow it to climb cascades, waterfalls and other wet obstacles. The fish was part of the first comprehensive survey of the island's freshwater fish species. The study, presented recently at a scientific meeting, was led by N.C. State's Thomas Kwak. "Many of these fish are very charismatic – they are unique and really worthy of conservation," Kwak says. He considers the survey "a huge first step in conserving and protecting these fish and their habitat." (Photo: Patrick Cooney, N.C. State.)