What would happen to the population estimate if animals that were marked tended to move out of the catchable population (deeper water for fish) or into an adjacent habitat for other animals?
what would happen to the population estimate if marked animals were either less likely to be captured in the second sample (e. g., fish avoid the boat after being handled) or more likely to be captured in the second sample (e. g., mice return to a trap because they know there is food there)?