I emailed the graduate admissions coordinators for timeline updates at each of my programs (because I'd rather know I'm rejected now than anxiously wait until April for the official decision). Here is some info from them:
-UCLA interview invites have already been sent out
-U of Minnesota interview invites have already been sent out
-UC Davis Population Biology interview invites have already been sent out
-UC Davis Animal Behavior interview invites should be sent out by around the beginning of next week
-UC Davis Ecology decisions go out between early February and late March, though she did not mention an interview timeline
