I play in english, but when you get the work task to survey wildlife, the tooltip on the task specifically lists the waterfall as an option, but if you go to the waterfall there is no option to do so. Here is a screenshot https://imgur.com/a/jvuSSM4
The pictures are very helpful. My first thought was that the task to 'survey' might be unlocked at the next career level. Then I realized you had completed two of the three actions of that task. Did you try taking a sample at the waterfall?
No, it doesn't work. I have gotten a task on a different day to take samples from the waterfall, so it's a separate action.
Luckily survey does appear in all the other places listed, so it doesn't prevent you from completing the daily task. It's more of a minor annoyance than game breaking.
