I will present the latest results obtained by the new UKIDSS Ultra
Deep Survey (UDS).
I will focus on the cosmological evolution of K-band selected
galaxies, with particular emphasis devoted to the most massive sources
and to the differential evolution of the populations of passive and
star-forming galaxies.
Furthermore, by exploiting the large area of the UDS field we
investigate the properties of UV-selected galaxies at z~6, comparing
the results with the latest predictions of the models of galaxy
formation.
Finally, I will briefly discuss our latest results on the evolution of
dust-enshrouded massive galaxies obtained with the SHADES survey.