You have to be creative - giraffes are tall, eagles have wide wingspans. I can only assume future iPhones gather nuts for winter hibernation.

Obviously not. It's up to the tinkerer to figure that out (which is clearly possible by tracing around).

Again, this is pretty trivial with a disassembler such as Hopper that can generate pseudocode.

Hopper - http://www.hopperapp.com/