Ruvan22 posted...
Ahh interesting - Warcraft's lore change has been somewhat similar over the last five - six years
Can Tyranids and Orks transport between planets easily enough for a few eggs/spores to infect/take over a whole planet?
Definitely. Orks and Tyranids probably have the highest populations of all the Warhammer 40K factions. What keeps the Orks in check is that they constantly fight with each other when there is no one else around. Even on the tabletop Orks have to make a special roll to see whether or not Ork units will start attacking each other.
This also works out in that major Ork populations can actually act as a bulwark against Tyranids like in the Octarius sector. The Orks and the Tyranids had been fighting each other to a stalemate for decades in massive wars of tens of millions. Only recently have the Tyranids finally overwhelmed the Orks.
Tyranids travel around space in huge bio hive ships that they use to seed planets when they come into orbit. The hive fleets look like giant tentacles out in space with each hive fleet being monitored and given names like hive fleet Leviathan or hive flee Behemoth. All these hive fleets are suspected to be offshoots of an even larger Tyranid swarm that isn't even in our galaxy yet.
Tyranid lore vid https://www.youtube.com/watch?v=intJPrVtNh4
The Orks do build their own ships as well, but they will also hollow out asteroids and use them as gun platforms and move them around by either towing them or building engines on to them. When Orks make planetfall they literally crash their ships and will take casualties in the thousands, but their numbers are so great that they don't even care. Orks are also known to infest space hulks and drift around in the warp fighting demons until they either get slaughtered or get spit back out into real space.
Here's an Ork lore video https://www.youtube.com/watch?v=1j3QRl-Vuro