It also depends on what your subject is & what lens you have available. For small birds I'd generally need more than I have (along with better focusing/sharper optics).
If I don't have to crop the hell out of a shot 16MP has always proved more than plenty & I rarely had problems when I only had 6MP.
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Mike
Pentax K5ii & Panasonic G5 user (with far too many bits to list)
Member of North Essex Photographic Workshop
Also online with PentaxUser.co.uk, Flickr, MU-43, MFLenses...
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