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I spent a month counting animals in a small African preserve. The way it worked was that each member of the team would walk in a given direction for a few hours and make a note of all the animals we'd see in a two hundred metres radius. Also we all had one ranger which came with a 1940s rifle and one bullet.
There were one or two countings per day. We saw lots of animals. I never saw any large predators, although I saw lion tracks a few times. Hippos were probably the most dangerous animals we regularly met, so the banks of lakes and rivers were avoided. The other animals ignored us or avoided us.
Always fascinated to learn how animal populations are counted! Kayaking with my gf, we ran into a nerdy college student on the river's edge with a clipboard. He was tallying soft-shell turtles! Neat! Funny thing is, I have no idea how he got to where he was, and he certainly wasn't dressed for the mission. :)
Anyway, nice to hear about people like you, out in the field doing the work.
That's (a small part) of how wild populations get classified by the IUCN