TV highlights: Jon Stewart, Louis C.K. and Amy Schumer perform on 'Night of Too Many Stars'

(All times Eastern)Spy cameras disguised as a robotic dolphin, tuna, nautilus and squid capture never-before-seen footage of dolphins in their natural habitat off the coasts of Mozambique, Costa Rica, the Florida Keys and Australia on the documentary "Dolphins: Spy in the Pod" (Discovery at 8 p.m.).