The Predator Prairie Pups (P3s) have left the Aqueduct to go on a hunt for trophies. They must be driven back into the Aqueduct without their trophies or they'll soon expand out into the rest of Gaia!
This event is similar in nature to "Deadman Spies" in that the P3s have formed patrols to scout through the Beach, looking for "trophies". However, they are hostile to pretty much everything in the area, and you'll see them fighting all kinds of foes as they seek their trophies.
Defeat all 100 P3s in 20 minutes or less or the event fails for everyone.