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Description
Throught the years, around 200 species of birds has been recorded on Gressholmen. The island has a few houses and a forested area, but also a lot of open and rather rocky terrain, especially the area which is connecting it to the neighbouring island. This connection has helped create a shallow bay, which is a good spot to look for resting waders and ducks during migration. The bay is easiest explored with a telescope from the north. You can also approach it from the west, but at a bigger risk of scaring off the birds. Check the tide before you head out. Hvidklire and Almindelig Ryle are regular, while Lille Kobbersneppe, Tinksmed and Småspove are worth hoping for. Rarer observations include Kærløber and Stenvender.
Gressholmen is also a good place for summer birding. Species like Tornirisk, Gravand, Stenpikker, Stillits and Gærdesanger are regular breeders, and Oslo's (probably) last pairs of Stor Præstekrave can be found here. The island is also rich in butterflies and flowers.
In the south-western part you will find Heggholmen, which gives a decent view if you want to find waterfowl out in the fjord. There are other islands and spots around the fjord better suited for the purpose, but if you have your telescope it's worth checking for Sortstrubet Lom, Gråstrubet Lappedykker and various alcidae during the winter half of the year. You might also find wintering Skærpiber here during the colder months if you are lucky.
Details
Access
Gressholmen is only accessible by ferry. There are hourly (and more) departures from Aker Brygge during the summer months, while you have to plan a bit better if you are heading out during the colder months. Taking the first boat out is always recommended, as there will be fewer people and less disturbances then. For the timetable of the ferry see the link below.
The island has rather well kept paths, and walking is easy. There are rocks and roots, though, so watch your step.
Terrain and Habitat
Forest , Scattered trees and bushes , Beach , Mud flatsConditions
Flat , Rocky , Hilly , Open landscapeCircular trail
NoIs a telescope useful?
Can be usefulGood birding season
Spring , Autumn , SummerBest time to visit
Spring migration , Autumn migration , SummerRoute
Narrow trail , Wide pathDifficulty walking trail
EasyAccessible by
FootBirdwatching hide / platform
NoExtra info
Be aware that camping on Gressholmen is prohibited, so you will need to make it to the last boat back. On warm spring and summer days, the island gets crowded quickly.