These can be pretty hard to spot in the park, and even harder to take a decent photo of! They are so hard to spot that people now and then report them as "off-show" on ZTL even though that they have been on-show for years.
They are housed in the second part of the freiflughalle (the part called wellenanlage/brandungsanlage, with the wave machine) and are always sitting high up in the trees, right above the footpath (you can see piles of poop on the path where they usually sit).
This is the first time I got a decent photo of one.