We were grateful last week for the many who responded to identify the new San Francisquito Creek resident as a Black-crowned Night Heron. This week presents another mystery. The creek is no longer flowing under the bridge, and the previously identified heron has now taken up residence on the west side of the bridge on top of a large pile that just might be a nest. But here’s a new development: he/she seems to be sharing nest tending – if that indeed is what’s going on – with a Great Blue Heron (inset). This observer spent a number of minutes watching for any fractiousness or territory protecting but the two bird seems to be existing happily together. It brought memories of the story a couple of decades back about a Vermont moose that feel in love with a cow. So bird lovers, what’s the deal? Is it possible for these two different heron species to pair up?