I use these to watch my girls during the day...you can listen to what's going on AND it has a feature to talk to them too (we haven't tried that at all..havent had the need yet):
I've recorded Katana a few times while at work using the webcam on my laptop. It's how I know he screams and howls and bites his crate while I'm gone...
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http://www.target.com/p/foscam-wireless-n-ip-camera-black-fi8910w/-/A-14278252?ref=tgt_adv_XSG10001&AFID=Google_PLA_df&LNM=14278252&CPNG=Unassigned&kpid=14278252&LID=PA&ci_src=17588969&ci_sku=14278252&gclid=CPOdtuqR1L0CFYN0OgodxDEA8A
I believe you can find it at a bunch of different places for cheaper too...but this is a good camera