me personally i have to go with the one from the Derelict. although never seen alive it is one dangerous thing. 3 main reasons.

1. did you see how many eggs that thing laid?
2. (i maybe wrong in this) from my understanding the derelict was moving through space so if it hit a planet and it still survied imagine the devastion that it whould cause with all those eggs on board
3. this queen had to be involved in the death of the space jocky wether this is a big accomplishment or something small with little consquence i dont know. but it was something

a fine is a tax for doing bad and a tax is a fine for good