Where do animals go? With the WATLAS project, we follow where Red Knots go in the western Dutch Wadden Sea. We aim to answer research questions such as: How do these shorebirds move with the tide? On which intertidal mudflats do they feed, and with whom? Do individuals differ in where they go? And how long do they stay in the Wadden Sea on their migration? In June and July, Red Knots breed in the arctic. The rest of the year, they live in coastal areas of western Europe in search of food and safety. The Wadden Sea is an important and unique site for Red Knots, and many other shorebirds. Yet, there are many threats such as sea level rise and habitat destruction. By investigating where animals go, we can identify whether they can deal with such threats and how.