User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4563270-20130414004932/@comment-67.185.134.172-20130414055950

The limit is six monsters in low rank. I've seen it in Tri and Ultimate. I don't know if there is a cap on the high rank monsters though. You should either use the Autotracker skill, pyschoserums, or the Fluffy mask to see if other monsters show up. From my experience, I've basically stayed in the same area where I've killed/capped a monster and waited for the body to despawn, then use the fluffy mask skill a minute later to see if any other monsters have spawned. I think moving to a different area or pinging too early lessens the chances of another monster spawning, but I can't say for certain.