I was keen to see how it is that - after five years of regular patch work on Hong Kong's most southerly island - Geoff has been largely responsible for taking the Po Toi "list" above 300 species.
Geoff's regular seawatching takes place at both dawn and dusk. Last week we were looking out for Short-tailed Shearwaters, which were due to pass Hong Kong on their annual passage up the western Pacific.
Most of Hong Kong's migrating birds had already passed through but some "Visible Migration" was in progress, for example, this group of mixed Little Egrets and Cattle Egrets, perhaps coming up from the Philippines on their way north.
Some birds even tried to join us on the rocks....
"lucionensis" Brown Shrike
But most of the stuff seen, predictably, were birds you might expect over the ocean.. and quite far away, like this Bridled Tern
Black-naped Terns breed in HK, and this one was probably a local one on patrol..
During lulls in the proceedings, I amused myself by snapping the very co-operative Pacific Swifts in the area.
And it's always gripping to see frigatebirds... Geoff had distant views on Tuesday morning, but this Lesser Frigatebird came a bit closer on Thursday in the early morning sunshine.
And what about the gripping spectacle of Short-tailed Shearwater migration ? Well, the Shearwaters obviously had a prior engagement, and failed to show at all.
An example of one of Geoff's monthly Po Toi summaries can be found on the HKBWS website here :
Elsewhere on the island, there were some decent migrants around, like these Blue-tailed Bee-eaters, pausing on their way to Fujian Province to our northeast.
Lurking in the grasses behind Po Toi's seafood restaurant, a Cinnamon Bittern and a Yellow Bittern..
Best of all, we were able to sit at the edge of the water in Po Toi's harbour and drink beer while watching this Chinese Egret, which had been around for a few days.....
But it seems like the egrets and bitterns are among the last of Hong Kong's spring migrant birds, so most of spring's birding excitement is over.