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Would anyone who's ever seen The Big Bang Theory (7 p.m., CBS/Ch. 2) be surprised to learn that Sheldon is afraid of bird? Sheldon is afraid of so many things.In this week's episode, however, Sheldon has to covercome his ornithophobia.Meanwhile, Leonard and Penny try hanging out alone.Elsewhere on TV ...Community (7 p.m., NBC/Ch. 5): Annie plans to move in with Troy and Abed.The X Factor (7 p.m., Fox/Ch. 13): More hopefuls are eliminated.The Vampire Diaries (7 p.m., CW/Ch. 30): Klaus puts his plan in motion, and Damon tries to stop him.Parks and Recreation (7:30 p.m., NBC/Ch. 5): Leslie hosts a model U.N. at the local high school.The Office (8 p.m., NBC/Ch. 5): Pam trains her temporary replacement.Grey's Anatomy (8 p.m., ABC/Ch. 4): Meredith and Derek get news about Zola.Bones (8 p.m., Fox/Ch. 13): The team investigates the death of a competitive eater.The Secret Circle (8 p.m., CW/Ch. 30): Cassie tries to figure out why she has powers separate from the circle.Whitney (8:30 p.m., NBC/Ch. 5): Things get too competitive when Alex and Whitney play basketball.The Mentalist (9 p.m., CBS/Ch. 2): Patrick Jane and others are taken hostage by an armed man accused of murder,Private Practice (9 p.m., ABC/Ch. 4): Addison and Jake face a tough choice.Prime Suspect (9 p.m., NBC/Ch. 5): A man dies under suspicious circumstances at a hotel.It's Always Sunny in Philadelphia (11 p.m., FX): The gang sneaks into a house to "extract" and "artifact," only to learn the place isn't vacant.