Act 4 (6 Swarms)
Chapter 1: The Only Way Through
#11 - When you reach the highway, pass the dropkit and look left of the road. You’ll spot this swarm up here.
Chapter 2: Maneaters Prefer Tight Spots
#12 - Soon after Ishi is taken, you’ll be led outside. Instead of going down the stairs in front of you, turn right and you’ll spot this swarm.
#13 - At the bottom of all those stairs you’ll have a short conversation with Trish and likely see a dropkit. Instead of continuing past it, look left to find another swarm.
#14 - As you climb up this large set of stairs you’ll see this swarm above one of the cacti. You may actually not notice it if you take it out with an explosion during all the action.
#15 - As soon as you enter the greenhouse turn right to find another swarm.
Chapter 3: Itchin’ to Crumble
#16 - To the right of the Cliffside Hotel entrance.
Act 5 (2 Swarms)
Chapter 1: Crash Resistant
#17 - After taking out the gyrocopters and ensuing baddies, slide under the branch and not far from the Newsbot you’ll spot this swarm, right of the stairs and above the sewer vent.
Chapter 2: How Do We Solve That?
#18 - Turn right as soon as you enter the first building and go down the corridor. There is a swarm hiding behind the kickable door at the end of the hall.
Act 6 (1 Swarm)
Chapter 2: Bad Trouble a Knockin’
#19 - After the touchy-feely conversation with Ishi during the ride over the big vat of toxic waste, turn around and you’ll see a swarm down in the vat.
Act 7 (2 Swarms)
Chapter 1: That Thing is Leaving Without Us
#20 - After you pass through the Deep Space Café entrance you’ll need to kick through a door. Just through that on the right is another swarm.
#21 - Once you exit the vent leading out of the cargo hold, just look left. Here you’ll see the final swarm of the game!