"Bird Watching" in Dying Light 2

The task can be taken after the story mission "A place that I will call home." As a reward, you will receive 1250 combat experience points and 3750 parkour points.

You need to talk to Adrian, who is standing on the roof south of the subway in the city center. Head to the radio tower at the marked location. To climb it, you first have to access the middle part or use the ventilation hole in the building to the east. And you can find a winch located on the road.

Once inside the building, head towards the ramp hanging off the edge and paraglide towards the building. There is an updraft here, which will allow you to gain height, and you can grab onto the ledge. From here, climb up to a higher ledge and paraglide from the corner once more, but this time towards the radio tower. The updraft will lift you up. Once on the radio tower, use the yellow pipe to climb it and explore the bird's nest.