The Tiger
I get that Martin's grief over the tiger is both a delayed reaction to the deaths of the Armstrongs and his realisation that he and the tiger are essentially in the same predicament - alone, hunted and waiting to be killed. All that aside, don't you think the tiger looked like Frances O'Connor:
http://francesoconnor.fansiter.com/pictures/frances-o-connor2.jpg
http://4.bp.blogspot.com/-d_A6gGniKLQ/UVrv7fBKyWI/AAAAAAAACko/YRcvfc-p 1t0/s640/Tasmanian+tigers.jpg
https://www.youtube.com/watch?v=OI3shBXlqsw