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laestli wrote:

Grey Templar wrote:there have been cases of Nid Fleets fighting each other to make one stronger.

the weak fleet is destroyed and the strong fleet becomes stronger. and Biomass isn't lost.

Where is that? I've never heard anything of the sort before now.

It was mentioned in the previous Tyranid codex.

In response to the OP,

zilegil wrote:
Is it likely, or even possible, for, for example hive fleet Leviathan to ally with hive fleet Naga?

Its doubtful the Tyranids have any concept of factions. They are one species guided by one will. I see no problems with Hive Fleets working together.

zilegil wrote:
Or an ork warband to ally with Tyranids?

Definitely not. Anything that is not a Tyranid is food. Often, there are even exceptions to that rule.

zilegil wrote:
You would think that the Tyranid hive mind's eternal lust to feed would not allow so? Would you not? I'm not sure.

Anything that is not a Tyranid is food. There is no reason for the Hive Mind to bother attempting to communicate with its prey, assuming such a thing is even possible.

zilegil wrote:
Controversially is it possible for a Tyranid fleet to attack another Tyranid fleet?

Yes. It happens for a few reasons. Usually its just wargames played out by the Hive Mind, or attempts to forcefully breed useful quirks. Sometimes a Hive Fleet will acquire useful traits that would do well to be brought into a larger or more vital Hive Fleet, and this is the most direct way.

zilegil wrote:
Does the Tyranid hive mind control the whole invasion? Or is there one mind for each hive?

There is only one, all-powerful Hive Mind. It has some form of presence in every Tyranid organism.

zilegil wrote:
The hive mind is very intelligent. But what kind of intelligent?

There is some debate about this. Some think its a sentient entity. Others think it exists only as an ant-colony appears to be intelligent and coordinated.