You can go into the settings menu and set a power save/shut off / stand-by mode. I've got mine set to 2 mins coz I used to leave my Panasonic LMC-FZ5 on all the time and it would get dead, so I learn from that.

About the lens and Wildlife. I believe you should get a Sigma 50 - 500mm. Personally when I try and shoot wildlife (I suck BTW) I find that the Sigma 70 - 300mm that I have right now is pretty useless. It really doesn't reach far enough and if you wanna do a safari it will not (trust me on this) be long enough.

Macro Lens: I suggest getting a Sigma 105mm. It's got a decent angle of view for the cropped censor and it's cheap. If you really wanna spend some money I'd say go for the Canon MP-E 65mm Macro it's got a awesome, fantastic, wonderful 5 times lifesize magnification!!! WOWSERS!!!

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