This 2013 animation video shows how dangerous it would then be for otters, or other animals, to cross from Ankeveense Plassen to Naardermeer reserves because of traffic. There were no otters, rare in the Netherlands, in these nature reserves then.
In 2013, wildlife tunnels were built under the busy road between the two reserves. Wildlife started to use these tunnels: roe deer, red foxes, hares and others.
In 2016, for the first time an otter was seen in the Ankeveense Plassen.
And this week, for the first time, camera traps saw an otter in the Naardermeer for the first time in over fifty years. Probably, the animal had used the wildlife tunnel.