..can I get away with telling ds2 that the wolf was just chasing the baby caribou to give him a bit of a wash? He (and ds1) would love it - but I don't know about the 'eating' bits 
As a child I used to get really upset by the big bad carnivores eating the cuddly little herbivores but, honestly, I think my kids may be made of sterner stuff than me.
Any thoughts?