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Yep! Growing up in the American Northeast they are a prominent education module because it's an easy field trip :D

I've caught them in bays of the Gulf of Mexico. They must be everywhere.

Why what wrong with the title? Seems clear to me, just try reading out loud.

It took me a couple tries to parse as well. At first I thought "counting" was a verb, leading to the impression that a horseshoe crab had been taught to count and was now counting alongside New York's citizen scientists. I figured perhaps it had something to do with prior research on crab computing: https://phys.org/news/2012-04-scientists-crab-powered.html

"Horseshoe crab census" would had been the obvious solution available

Horseshoe crab-counting...the hyphen makes a [UK English only?] difference.

I found it hard to read - I thought they may have crowd-sourced some telescope buffs.