Tardigrade National Geographic Channel Homepage five space or at 300 degrees farenheit tardigrade, or water bear http://tvblogs.nationalgeographic.com... Tardigrade five toughest critters National Geographic’s website five National Geographic’s website Tardigrade tardigrades 5 Reasons Why The Tardigrade Is Nature’s Toughest Animal 5 Reasons Why The Tardigrade Is Nature’s Toughest Animal National Geographic Tardigrade tardigrades Channel Homepage water bears some photos and film So superheroic that it survived all five mass extinctions.