What are these round shapes?

6 comments

1. My wife and I traveled to Germany last fall and we saw these perfectly round shapes (invasive vegetation?) in many trees. What are they?

2. Mistletoe

3. Looks like birds’ nests.

4. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT4iwGCHyAo3Lt5KQU5oezMQuJdWG_jUIdxHA&s

5. Probably genetic mutations or something like that

6. I used to think those were giant nests

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