Allos stay alone until another allo gets close enough. When an allo finds another allo they will join forces and form a pack. The highest level allo becomes the leader once the pack reaches a size of 3 allos. A pack of allos will always follow each others no matter what. They usually follow the leader, but can follow a different allo if say a player calls over that specific allo to follow him . If they wander too far from each other the bond will be broken and the allos will set off on their own until they find each other again or other allos. Once a pack reaches a certain size the allos will stop accepting other allos in their pack. The same goes for tamed allos. Once they reach the max pack size of 15 and more allos are introduced your original 15 allos and the new allos will form different packs. Hope this helps you understand allosaurus pack behaviors. Thanks for reading.
The Allosaurus is a pack-hunting theropod that's smaller but faster than Rex. When in packs of 3 or more, the highest level Allosaurus will become the pack leader, emitting a red aura and making it stronger in battle.~Steel Cookie 123
If you really think about it, these are SOOO underrated. Incredibly high damage and speed. A pack of 10 is easily better than a Giga. 3-4 ballista bolts, (lvl 29 btw) can make a Giga rage, and ballista bolts have a VERY long range, so... you’re dead if you’re riding it. Against a level 30 player. You see 10 Allos coming for you? Run for your ballista? 3-4 Allos dead, still 7 Allos killing you. Even rockets against 10 or so Allos? Crap. You’re still dead. They are so fast and can 20 shot ANY creature in the game if it’s an alpha. Yes, Titantos? Dead in 20 shots. (5% of the creatures health over time.) (Doesn’t work on bosses.) Compared to a Rex, an alpha Allo is arguably equal. Base stats of the Rex are 1100 health and 62 damage. Alpha Allo is 787.5 health and 52.5 damage. They have much faster DPS than Rexes and have better stamina, allowing for more overall damage. Not as much health, but still. To a wild Giga (level 1) with the alpha attack they deal 4000 damage. 4000!!!!!!!!!!