Baby seal

The baby seal is one of the few animals that appeared exclusively in Total Drama World Tour.

Opening sequence
After Izzy, in a polar bear costume, scares off Lindsay, a baby seal scares off Izzy by biting her arm.

Anything Yukon Do, I Can Do Better
DJ accidentally runs into a baby seal after his eyes are frozen shut from crying in the cold, continuing the Curse of the Mummified Dog, which began in Walk Like An Egyptian - Part 1. After he runs into the baby seal, it flies off the cliff and into a freezing cold lake. Leshawna and Lindsay both lie to DJ, saying that they saw the baby seal climbing up the cliff. Lindsay even makes seal noises to make it more believable. After they leave the scene, the baby seal ends up climbing back up the cliff, glaring at DJ and growling viciously. The baby seal seeks its revenge five episodes later.

Can't Help Falling in Louvre
The same baby seal appears again in this episode to take its revenge on DJ. Chris brought it as "motivation" for the challenge. Lindsay then points out it's the same baby seal from the Yukon, which causes DJ to panic. The entire episode it chases him around while he tries to rid himself of his curse. It even attaches itself to DJ's head and slaps him in the groin with its tail, much to DJ's pain and discomfort.

Aftermath: Revenge of the Telethon
The baby seal is amongst the other animals in cages, when Geoff wants DJ to pet one of the animals to get the viewers to donate more money. It is later released by Blaineley, and it, along with the other animals, proceeds to attack the non-returning aftermath commentators and the aftermath guests.

Aftermath Aftermayhem
The baby seal makes a minor appearance as Blaineley's superfan throws it at Bridgette's head while she is tricked by Blaineley to interview to that country.

Awwwwww, Drumheller
The baby seal makes a brief cameo appearance, fleeing the Total Drama Jumbo Jet along with several other animals and a feral Ezekiel before the jet explodes.

Planes, Trains, and Hot Air Mobiles
The baby seal is seen in cages, along with the other animals and Ezekiel from Total Drama, being loaded onto a truck.

Trivia

 * The baby seal is one of the animals that attacks DJ in an online game, Total Pandamonium.
 * It is worth mentioning that the idea of presenting a baby harp seal on Total Drama World Tour, a Canadian show, is possibly related the recent and ongoing political battle to ban the Canadian Seal Hunt in Canada.
 * Total Drama World Tour is currently the only season which to feature Baby Seal, as it did not appear in future season or before.