Muttation

Muttations, sometimes referred to simply as mutts, are animals that have been genetically altered by the Capitol for use as weapons, intelligence, and other activities.

Jabberjays
Jabberjays are a type of bird that were created to spy on enemies of the Capitol. Jabberjays had the ability to memorize and repeat whole human conversations, and were used to gather words from the rebels. Once the people in the districts realized how their private conversations were being transmitted, they used the jabberjays to feed lies to the Capitol. The Capitol therefore ceased using the jabberjays and abandoned them to die off in the wild. However, by the 75th Hunger Games, the Capitol had replenished the Jabberjay population and used them in one of the time "sectors" which drew in and trapped tributes such as Finnick Odair and Katniss Everdeen with voices they knew from back home.

Mockingjays
Mockingjays are accidental muttations that were created when mockingbirds mated with jabberjays. They pick up songs very quickly and can relay them back and forth to people or other mockingjays. Since the Capitol did not mean for these birds to exist, they are viewed as a symbol of rebellion within the districts. However, after victor Katniss Everdeen's use of a mockingjay pin in the Games, mockingjays went into vogue with the people of the Capitol and their likeness often appeared in clothing, jewelery, and other objects.

Tracker jackers
Tracker jackers are deadly wasps that were made by the Capitol and placed around the districts during the first rebellion. They are larger than regular wasps and have a solid gold body. Their stings raise lumps the size of plums on their victims, and their venom causes hallucinations that can drive people to madness, and more than a few stings will kill a person; some people die after just one. These mutts will also hunt down anyone who disturbs their nest and attempt to kill them.

Wolf creatures
In the 74th Hunger Games, the Gamemakers released a pack of wolf-like creatures on the final three tributes, Katniss Everdeen, Peeta Mellark, and Cato. These creatures were able to balance on their hind legs and jump very high, and had four-inch long razor-sharp claws. Each of the mutts resembled one of the tributes who had died previously in the Games as their DNA was mixed with a form of wolf. This made them look so much like their Tribute that Peeta wondered if they had been made using the tributes' real eyes. The muttations mortally wounded Cato and then retreated after he died. This Hunger Games was the only year that these creatures were used, acting as a painful and effective weapon to drive together the remaining tributes.

Monkey creatures
In the 75th Hunger Games, one section of the arena contained a mutated species of orange monkey that viciously attacked the tributes, even killing the female Morphling when she saved Peeta's life. They used their claws to make deep punctures in their victims' flesh that looked harmless, but in reality were deep enough to cause internal bleeding.

Lizard Mutts
In Mockingjay, after President Snow realizes that he did not manage to kill Squad 451 and that they escaped underground, he sends lizard-like muttations after them. The Mutts were four-legged with sharp talons at the end of each finger, had tight pale white skin and were the size of humans while on their hind legs, they had long reptilian tails, arched backs and heads that jut forward. They also have strong jaws which enable them the ability to decapitate their victems in one bite. The Mutts had the ability to walk on their hind legs as well as on all four which Katniss described as skittering movements. When Katniss got closer to them she saw that they seemed to be a mixture of humans and reptiles with faces of conflicting features They gave off a scent similar to that of President Snow's roses and had Katniss' scent to track and only hers. They spoke through mostly hisses but were also given the ability to say Katniss, most likely to discourage her. They were able to be killed but only after much effort being shot with hundreds of bullets and arrows could barely kill one, and there seemed to be an infinate amount of the Mutts. All the mutts were killed when Katniss made her Holo explode on them, though the Mutts managed to kill most of Squad 451, Jackson, Leeg 1, Finnick, Castor and Homes, before their anihilation.

Others

 * In the 75th Hunger Games, one of the time "sectors" in the arena had an unidentified mutt in it which ripped apart a tribute so bad they could not be identified. That Mutt was labeled as extremely large and very fast.
 * Another section contained a large quantity of insect-like creatures, much like grasshoppers or crickets, but with large pincers that they would click continuously. They were a serious threat when the swarmed, which caused tributes to attempt to avoid them at any cost.
 * In the 50th Hunger Games, giant, candy pink bird-like muttations were used in the arenas, and killed at least one tribute, Maysilee Donner.
 * Another muttation used in the 50th games were carnivorous, golden, fluffy squirrels, which killed many tributes.
 * Yet another muttation used in the 50th hunger Games were a special breed of butterfly that were designed to appear beautiful to attract victims which it would sting somehow which would cause agony to them if not cause death.