If aliens travel across such space to "eat fleshlings" planet by planet then they are very poor farmers. Plant life would probably be much more
abundant than carnivore mammals and reptiles, birds and fish and that is an understatement . This is the simian cannibal like thinking from the
human mind when humans like to represent likes,wants,needs universally. A species would probably replentish on energy or light or some unknown
resource imo, maybe human brains. If aliens can reach earth it is safe to say they have a chicken plant, or Beef or Pork plant. I doubt they would be
carnivores and be so advanced at the same time. They would probably have replication technology not much unlike star trek. Again we are thinking on a
"what we would do to us" hungry. They cut the bunghole and eyeballs out of cows and waste all that good angus. And Hawkings hypothesis is
unrealistic in that respect.
Maybe they just want to eat brains, or just want to eat our socks
[edit on 15-8-2010 by Unknown Soldier]