Pay TV: Wednesday, February 27
Sharks of Lost Island, Nat Geo Wild, 7.30pm
A GROUP of scientists head out to the Pitcairn Islands in the hope that the islands' extreme remoteness will let them see what coral reefs were like before human activity began to affect them. Sure enough, the reef around Ducie Island is pristine - the most notable difference from other reefs being the sheer number of sharks swarming all over it. Inevitably, though, the scientists begin to make alarming discoveries. On one of the islands an invasive weed is covering ground-nesting petrels with sticky goo, gunking up their feathers so they can't fly and end up starving to death. On another, introduced rats have survived an extermination attempt and continue to threaten flightless birds. The absence of sharks on another reef suggests that commercial fishing might have arrived unannounced. The documentary ends with the members of the expedition, sponsored by the Pew Environment Group, trying to get the Pitcairn Islanders interested in creating a huge marine reserve.
Catfish: The TV Show, MTV, 10pm
THREE words that can save a whole lot of heartache: reverse image search. Tonight presenter Nev Schulman comes to the aid of exotic dancer Trina, who has begun to worry that her online boyfriend might not be who he says he is. He's sent her sexy photos of himself but keeps finding excuses not to meet or do video chat. Without giving away anything about this episode, it's a pity Schulman doesn't delve deeper into how people delude themselves for so long and why they don't do the simple things that would give them the answers they need.
RuPaul's Drag Race, LifeStyle You, 9.30pm
Performers with such exotic names as Phi Phi O'Hara and Jiggly Caliente compete to become America's next drag superstar. New series.
Smash, SoHo, 7.30pm
The new series has brought some terrific new songs and fine vocal performances. Team Ivy all the way!
Behind Mansion Walls, Crime, 7.30pm
Barry Crocker presents true-crime stories.