Trust me, I am not the Traitor.
For Orcs there is no other life but WAR!
The raft provides only one neutral pawn, and you can choose each round what you want to use it for (i.e. if it is a grey or a green one)...
And the two food sources (fish/bird) are the same except for effects that target one specific type. Like the one you mentioned.
So if an effect depicts the "bird" source, only food sources with the bird symbol are affected or applicable...
Thanks that's what I was looking for!