New Animal Planet show “Scaled,” about designing habitats for reptiles, makes its debut.

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‘Treasure Quest: Snake Island’

Season-four premiere of reality series that follows a crew of treasure hunters as it searches for a legendary trove in South America. The treasure hunters, chasing a $2 billion fortune, attempt to cross the Andes mountains, putting themselves in danger on the infamous Death Road, where they encounter a landslide; 9 p.m. Friday on Discovery.

Also on Friday

“Safari Live: The Gauntlet,” 8 p.m. (NATGEOWILD): Expert guides lead viewers on an African safari.

“What Would You Do?” 9 p.m. (KOMO): Hidden cameras capture people’s reactions to dilemmas.

“Wynonna Earp,” 9 p.m. (SYFY): The holiday season comes to Purgatory; Wynonna teams up with a new ally to search for a child on Christmas Day; Waverly learns more about her father.

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“Scaled,” 9 p.m. (ANIMALPL): Series premiere; habitat designers meet a Washington state family that wants to create a grand Mayan-inspired terrarium for its extensive collection of poisonous dart frogs.

“Diners, Drive-Ins and Dives,” 9 p.m. (FOOD): Seafood for breakfast, lunch and dinner in Portland, Oregon; taste-testing new pizzas in Jackson, Wyoming.

“In Search Of,” 10 p.m. (HISTORY): Zach visits a Florida man whose brother was killed when the family home was swallowed whole and a series of sinkholes forming caves below the houses in a suburban neighborhood.

“Real Time with Bill Maher,” 10 p.m. (HBO): Maher and panelists discuss politics.

“Kevin Hart Presents: The Next Level,” 11 p.m. (COMEDY): Showcase for rising comedians; comic Jeff Horste tells Kevin Hart about his strangest gig and talks about what it was like growing up in Detroit.

Madeline McKenzie: mmckenzie@seattletimes.com. Program times may vary depending on your cable provider or service.