Ultikana, that was good but the population was a bit high.

On another note, here are some of the mutants that you can expect to see:

[b]Nosalis:[/b](Metro series) A large mole that has developed large claws and a bipedal stance to better hunt prey and defend itself from predators. Though they live underground they occasionally come to the surface, they are usually found in groups in buildings with basements, basements, and underground tunnels/caves. Picture for reference: [hider=Nosalis][img]http://img1.wikia.nocookie.net/__cb20101227230013/nonciclopedia/images/a/a6/Nosalis-Metro_2033.jpg[/img][/hider]
[b]Watchers:[/b](Metro series) Mutation of certain dog breeds that normally roam in packs on the surface. Alone they can be dangerous but in packs can tear even heavily armed men apart. Picture:[hider=Watcher][img]http://vignette1.wikia.nocookie.net/metro2033/images/0/06/HoppinWatchman3.png/revision/latest?cb=20130520213309[/img][/hider]
[b]Demons:[/b](Metro series) This creature has so many origin stories no one truly knows what they were mutated from. Some say birds and some even say cats but one thing remains true. These creatures nest high and are capable are taking down slower aircraft. You either need to be really fast, really quiet or really strong in order to take these on. Warning: Extreme Caution [hider=Demon][img]http://vignette1.wikia.nocookie.net/metro2033/images/3/32/DemonConceptArt.jpg/revision/latest?cb=20110507001924[/img][/hider]

The list above are the more unique mutants, others are more like animals and some are badly mutated.