I feel like my theories are hitting right and wrong all the time with this manga xD
I thought the climber guys were monkeys because of their ability to climb like the monkey but atleat right now they aren't the only ones (and probably aren't monkey to begin with, just somg weird folks)
And Saotome noticed that the monkey he tackled was different, probably body size/weight/etc, so he noticed there were more than 1 monkeys
I cannot tell where this is going and that I like, very mysterious 😄