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He wanted to get the three remaining tributes, Katniss, Peeta, and Cato, into one place in the arena.
Because they notice that they all look like all the 22 tributes
The mutts look like wolves, only with some human qualities. Not exactly werewolves, but very close. The creepiest\most interesting thing about them, is that their eyes and fur are made to look like the dead tributes that died in the Games.
Actually, they resembled the Tributes that have been killed, including Glimmer, Rue, Marvel, Clove and the other ones that were unnamed. However, this does not include Cato because he is still alive by this point in "The Hunger Games".
Mutts are mutations that the Capital created to end the Hunger Games by driving the remaining Tributes together.
The other Tributes kill them as well as everyone in the arena. The D1 male tribute (Marvel) dies when Katniss shoots him with an arrow. The D1 female (Glimmer) dies when too many venomous tracker jackers sting her. The D2 male tribute (Cato) dies when Katniss shoots him in the hand with a bow and arrow and then Peeta pushes him into the mutts. the D2 girl tribute (Clove) dies when Katniss and her are fighting and Thresh pulls her off of Katniss and smashes her skull.
Cato is a District 2 tribute. He is large and violent, killing most of the tributes. When his district partner dies, we see his innocent side. He cries. Peeta, Katniss, and Cato were the last 3 tributes left in the games. Unfortunately, Katniss shot an arrow at him and he was eaten by mutts. He died.
No, the actual bodies were sent back to their respective districts for funerals. The wolf muttations (called mutts) were most likely made by combining wolves with each tribute's dna, which could've been collected by the prep teams. There was most likely muttations made from Katniss and Peeta's dna as well, though they weren't unleashed because Katniss and Peeta were still alive and the point of using the tributes in the genetic experiments was to freak the other tributes out
He dies in the last book. He is killed by Mutts.
Young Cato died because of suicide. Cato was a statesman and a politician in the late Roman Republic and he is also a known follower of Stoic philosophy.
The career tributes usually come from districts 1-4, but in the Hunger Games movie, the career tributes are the District 1 tributes, the District 2 tributes, the District 3 male, and the District 4 female. In Catching Fire, the careers are Cashmere, Gloss, Enobaria, and Brutus.
Cato is running from the mutts that the game makers sent to the last 3 he is also running before the mutts to catch thresh because he killed clove, his fellow tribute from district 2