What's the most jellyfish you've ever seen at one time?

A little while back I was walking over a bridge in the seaport area of Boston on my way home, and here is what I saw in the water down below:

The whites spots are all jellyfish.  Thousands of them.  Everywhere.  I was safely 30 feet above, and they still scared me.  If these jellyfish all teamed up they probably could have sunk half the boats in the harbor.  I thought maybe they were plotting to take over the city, but when I crossed the bridge again a few days later they were gone.

Here's a zoomed in section of the above photo:

Also, how awesome is my phone's camera?


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