high reproductive rate - this is beneficial as it means lots of offspring can be produced quickly
limited, or specific, diet - a limited or highly specific diet reduces the options an animal has for a food source. If something causes that food source to be reduced, the population would be highly vulnerable if there are not other options that it can use in its diet.
prefers various habitats - this is good as it provides the species with flexibility
variable migration - migration makes the population more dynamic and variable and quick to respond to change
