Bygdøy and the maritime museum to the left, Frognerkilen in the middle ... the smallest sea mammal I've ever seen, must be a dolphin. Unfortunately, no zoom on my telephone.
It's the first time I've observed mammals in the inner Oslo fjord. Oh, edit, I've seen humans and dogs swimming in the sea (though, mostly at summer time - only twice I've seen people swimming in the winter time). Even saw a moose swimming once, but that was in the outer Oslo fjord.
Full image on IPFS QmTNR5yvtV16AJHcq6LgLPJ3nxcUnieN8RxPJukrTFoHKr