Canon 40D.  More importantly, I try and use good glass.  The first photo was taken with a 10-22 EFS lens.  It's not an "L" lens but the quality is considered as such.  The bear photo was taken with a 70-200 f2.8 L IS lens.  The camera doesn't matter.  A cheap Rebel could take just as good of photos.  I'm a big believer in glass, not the light capturing devise.