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In nature, within rat populations, a social hierarchy develops within a burrow or natural structure like a fallen tree. Stronger males become dominant, while weaker males remain subordinate. Colony’s (whilst dependent on individual behavioural characteristics) will usually act like an ant colony, with individual groups of animals given task’s, ranging from sentry ar guard animals to collecting animals, who keep the nest stocked with food, the latter normally being the younger animals and therefore the louder due to their constant movement in and out during night time hours. When a female is oestrous, several males mate with her sequentially, in the order of their social dominance. When the colony grows too large, and the dominant animals feel that it has become unsustainable (approximately every 4 – 6 weeks on average) they will force up to 30% of the younger population to move out. These animals become outcasts and are then in need of a home and try to take up residence elsewhere. This results in a week or so of rustling, squeaking and scrambling noises as the colony goes in to, what in effect is a “CIVIL WAR”. These are the animals you will need to prevent starting a colony that comes from your surrounds after you have eradicated your colony, a regular baiting regime will control new colonisation from neighbouring colonies.