They are called bosses because the spawn in the final boss of the island they aren’t really bosses.
Defense Unit

Tips & Strategies from the iOS and Android app
In extinction you can kill multiple of these since they are so slow, if you kill a lot you will be able to make your own enforcer.
Ifyou force tame these and breed them they make Tapejara eggs lol
Use tek weapons to kill them and they go *EXPLODE* when killed. Get to da top so others see!
When you kill harvest with axe
Resources
Capabilities & Carrying
Carryable By
0/12ChartCarryable By
0/7ChartAffected By
3/7ChartCan Damage
6/6Chart
Thatch
Wood
Adobe
Stone
Metal
Tek
Fits Through
3/6Chart
The Defense Unit can fit through a 2 × 2 wall gap.
Doorframe
Double Door
Dinosaur Gateway
Behemoth Dinosaur Gateway
Hatchframe
Giant Hatchframe
Translations: وحدة الدفاع, Forsvarsenhed, Verteidigungseinheit, Unidad de defensa, Unité de défense, יחידת הגנה, Unità di difesa, 防衛ユニット, 디펜스 유닛, Defensie eenheid, Unidade de Defesa, Защитная единица, Savunma Birimi, 防御单元, 防禦單元.




