The trip to Sognsvann was intended to be a short one, just take a walk round the Sognsvann lake. But we ended up walking all the way to Ullevålseter camp - 5km from Sognsvann. There we took a 30 min break to have a munch and started back along another route. The lakes along the route have waters that temp you to take a dip, a welcome relief for the dogs, that come to walk in tow with their masters.
The routes are animal free, except the homo-sapians and their pets (mostly dogs), who come in so large a number that the animals shy away to the deeper parts of the forest. Insects you can find aplenty, even mosquitos, the first ones I encountered in Oslo. If the routes offer walking and trekking routes in summer, they become skiing paths in winter.