History Series / Zoo

* BusyBeaver: Jamie theorizes that these dam-building rodents were busy enough to divert a river, which flooded out a mine in New Brunswick.

** [[spoiler: The conclusion of the Season 2 finale where we learn that Robert Oz's cure was engineered to sterilize ''humans''.]]

* ShockAndAwe: Ants develop the ability to generate electricity. [[spoiler:They kill Chloe's boss by crawling inside her and electrocuting her from the inside. They then plan to blow up the Large Hadron Collider in Switzerland]].

* FlashForward: The final scene of season 2 where [[spoiler: ten years in the future, schools are closing because no more children are being born. Abe and Dariela watch their son Isaac be among the last graduates of his elementary school ever. Hybrid animals like the ones on Pangaea have spread and are attacking humans and livestock. Jamie has become a successful author. Isaac meets a woman who's Mitch's now-grown daughter Clem, who claims he's still alive and can fix the problem.]]

* FlashForward: The final scene of season 2 where [[spoiler: ten years in the future, schools are closing because no more children are being born. Isaac and Dariela watch their son be among the last graduates of his elementary school ever. Hybrid animals are still attacking with Jamie a successful author. Isaac meets a woman who's Mitch's now-grown daughter who reveals he's still alive and can fix the problem.]]

* {{Cliffhanger}}: The penultimate episode of season one ended with [[spoiler: the team's plane crashing on its way back from Africa]]. Now that a second season has been approved, the SeasonFinale's final scene of [[spoiler: a huge herd of escaped beasts from the D.C. National Zoo charging the team's vehicle]] can be considered this trope.

* BolivianArmyEnding: Subverted; the show ''would'' have ended like this, but another season has now been confirmed.

* MotiveMisidentifcation: The mistake everyone makes with the Noah Group, assuming their line of "we want to set the world back to the way it was" means restoring the balance before the outbreak. Instead [[spoiler: they intend to return the world to the animals by sterilizing the human race.]]

* UtopiaJustifiesTheMeans: The ''real'' objective all along by Robert and the Noah Group: [[spoiler: to "return the world to the way it was" by sterilizing the entire human race.]]

* AnyoneCanDie: [[spoiler:Chloe buys it in Season 2, when Dariela locks her in with the poison gas. Both Dariela and the others agonize over whether or not Chloe could have made it before the gas cloud]].

** [[spoiler: The conclusion of the Season 2 (Series?) finale where we learn that Robert Oz's cure was engineered to sterilize ''humans''.]]

* BittersweetEnding: [[spoiler:The animals are finally cured and all seems well...then we learn that Robert Oz re-engineered the triple-helix/Ghost gene cure to sterilize humans as well. Not only that but the hybrid animals that the Shepherds created on Pangea are still loose and attacking human settlements at least as regularly as normal predators would.]]

** Mitch hits this in [[spoiler: the season finale, as he's reduced to drinking and picking self-destructive bar fights because he thinks Jamie is dead and the cure for the animals, lost.]]

* [[spoiler: BolivianArmyEnding]]: Subverted; the show ''would'' have ended like this, but another season has now been confirmed.

* [[spoiler: BittesweetEnding: The animals are finally cured and all seems well...then we learn that Robert Oz re-engineered the triple-helix/Ghost gene cure to sterilize humans as well. Not only that but the hybrid animals that the Shepherds created on Pangea are still loose and attacking human settlements at least as regularly as normal predators would.]]

* IllGirl: Clem, who suffers from seizures [[spoiler: and is Mitch's daughter from a failed marriage]].

* DeadlyGas: "The Walls of Jericho" unveils this as the Noah Project's method for wiping out the animals. Later in the episode, Chloe and Dariela are forced to outrun a cloud of the stuff when it is accidentally leaked into a hallway. [[spoiler: Dariela makes it to safety and in a panic, closes the doors, just in time for Chloe to appear outside and seemingly suffocate to death while Dariela watches in hysterics.]]

* AbsurdlyYouthfulMother: Mitch's stepmom is about his age. They don't much like one another.

* BearsAreBadNews: Chloe's superiors cite a case of black bears attacking people in the Black Forest when they're recruiting the team. A brown bear menaces a Frenchwoman in her apartment in "This Is What It Sounds Like", and in "Sleuths" the team tracks down three more in some nearby drainage tunnels. Polar bears menace Jamie and a teenage girl in "The Moon and the Stars".

** In "Zero Sum", Davies' men overrun the Task Force's plane, intending to take Jackson prisoner [[TheyWouldCutYouUp as a human lab rat]] and hold the others hostage to his cooperation. Mitch responds by [[spoiler: opening the captive earthquake-sloth's soundproofed box, allowing it to unleash a sonic howl that nearly ''tears the plane to pieces in midair''.]]

** Taken UpToEleven in Season 2, with the animals such as vultures and snakes poisoning human food/water supplies, sloths communicating with moles to create earthquakes, jellies summoning hurricanes, polar bears holding a town hostage and demanding HumanSacrifice...

* DisneyVillainDeath: [[spoiler: After finding out that Logan is TheMole for General Davies, Jamie tranqs him and shoves out of the plane.]]

* DrivingQuestion: Whatever is making the animals join forces to attack humans.

* OneDoseForAll: Dosage from Abe's and Dariela's tranq guns doesn't seem to matter, as they use the same darts on rampaging dogs as they do on bears or big cats.

* InstantSedation: Whatever Dariela and Abe are loading into their tranq guns, it can evidently drop a brown bear in seconds. Dosage doesn't seem to matter, as they use the same darts on rampaging dogs and big cats.