These black shiny insects live on the leaves of the alder tree near the forest in Ukraine and make holes in the leaves. I know that in nature everything is useful and necessary, but I do not like such leaves of trees. These insects disturb harmony in nature. You can see in these photos how they turn the leaves into lace. You can of course look at these leaves as the original art :)
They live here in whole groups, and actively communicate with each other! It seems they have found the perfect environment to live on this tree, eat it and reproduce themself here! You can see in this video how it looks in reality :)
Why do they like these alder trees so much? And in general, what are these insects and what is their role for nature? Maybe someone knows?