They said on the news that there are probably about 15,000 of them. Though you have to wonder how they come up with that number.
“Though you have to wonder how they come up with that number.”
I imagine that they use some of the same capture-recapture statistical methods fisheries biologists use to estimate the number of fish in a body of water. Tagging a sample is probably a first step. (My guess would be “tagging” with an RFID insert.)