Well, just one, but it has a very sharp beak!
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YT: I was filming this blackbird during a few days, and I came to some conclusions:
1.Very few of nesting blackbirds actually attack people. There were dozens nests around, but only this one bird kept attacking people.
2. Most attacked people were going from left to right. Seldom, mostly runners, were attacked while going from right to left.
3. Bird attacked only when he believed he's not seen.
4. If a person had a hand atop of his head the bird did not attack.
5. Some people behaved much crazier than the bird. I observed one Chinese couple who were violently shaking the bush with the nest on it in order to make the bird to attack them in order to take a picture. The bird was circling over their heads, but never attacked them because they were looking at him.
6.In the last few frames I filmed the feeding of the chicks. Please note how the mother removed faecal sac (poop) directly from the chick's cloaca.
I asked park officials to put a warning sign, but it was not put.