Otherwise I glimpsed a Hazel Grouse and found a pair of Willow Tits inspecting a potential nesting site.
The second half was an afternoon trip with Bjørn Olav Tveit, author of the recently published first ever where to watch guide for Norway. Despite Bjørn Olav's knowledge and warm sunny weather with southerly winds we saw very little at Nordre Øyeren. Numbers of Teal were very much reduced from earlier this week with only a couple of hundered present. A few Greenshank were picked out at about 1 kilomotres range but nothing new except for a couple of House Martins amongst a handful of Swallows.
On the way back to Oslo we popped in at Østensjøvannet which is rich shallow lake within the city limits. A White-fronted Goose had been reported earlier and we easily located it - most likely the same bird seen earlier in April at Bygdøy. Also present was a strange hybrid seemingly paired with a Barnacle Goose. It can be seen in the following photo along with the White-fronted Goose, Barnacle Goose and Greylag Goose. I reckon it is a hybrid between Barnacle and Grelyag.