Best boss carnivore of The Island, maybe better than theris. This things SHREDS bosses and doesn't need that great of a saddle due to bosses not targeting it, which keep in mind they are big enough for the boss to get stuck, but small enough they don't pull aggro.

Rexes have around 1.1k base HP and 62 damage

Megalos have around 1k and 75 damage ( at night )

If you can find these at a good level, which is kinda hard considering spawn rate, locations and spawn cap of ( iirc ) 4, it is worth it to use them for bosses.

Megalos are the best Island boss killers, rexes are overrated. Just remember to start boss fights as soon as they wake up, you REALLY want to time it correctly. " What about the Dragon? " They sneak under it and since they are not it's target, just keep away with your yuty and you shouldn't need to worry about the fire breaths. The Broodmother minions can sneak up to your yuty, bring a megatherium to sit by your side and help fend them off.

Megalos are a great option for boss fights, they work on other bosses and maps too but the night limitation makes them more useful on maps with shorter fights, they also don't really do much at the TEK cave, so pump your way out of the overseer fight or bring a specialized army for it.

Tip by Vinícius. Hope this helped and gave you a great Island ( and other maps) boss creature. This took some good time to make, so, if you liked the tip, you know what to do.