Seals can be seen at low tide when they lie on sandbanks, near a trench. The favourite places where they rest are on the Roggenplaat and on the head of the Vondelingsplaat.
At the end of the 1970s the seal was virtually extinct due to hunting, pollution and disturbance of peace. In the Eastern Scheldt, there is a stable group of around 150 seals. They are not hindered by the storm surge barrier and simply swim through it. Seals are counted several times a year. These numbers can be found on the Natura2000 map on the Geo counter of the Province of Zeeland.
These are almost always "common seals", but the grey seal also lives here. They eat four to eight kilos of fish a day, preferably flatfish (e. g. plaice and flounder) which they extract from the deep gullies. In the wild, they could live to be between 20 and 30 years old. They will then be almost 2 meters long and weigh more than 100 kilos!
They’re not that scared of people when they’re in the water (they swim 35 kilometres per hour), but on a sandbank they are scared. In the summer, when the young are born, it is very important that the seals are left alone. The young need the whole low-water period to drink enough milk! If they are disturbed too much, they do not get enough fluids and get weak.
Various small to large round trip boats sail to the seals all year round. They are clearly visible from the boat without being disturbed. They are listed on the map with all activities under the icon varen (boats).