If you're a 5DII owner on the fence about upgrading to a 5DIII and you really don't have the cash

You have many viable options

Like a crazy mother-in-law

Tie the dog leash to your tripod leg

Leave it on top of the car and drive away

Get side tracked and leave it on the seat in a busy subway

Lend it to your cousin Bill Bob

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The Camera is only a tool, photography is deciding how to use it.
The most important piece of equipment in photography is the lens cap, if used incorrectly all your photo will be under exposed.
The hardest part about capturing wildlife is not the photographing portion; it’s getting them to sign a model release