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"Behavioral sink" is a term invented by ethologist John B. Calhoun to describe a collapse in behavior that can result from overpopulation.The term and concept derive from a series of over-population experiments Calhoun conducted on Norway rats between 1958 and 1962. [1]
The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 ...
A Norway rat can have litters from 6 to 10 young, and can be of adult breeding age in as little as three to four months, according to the Washington state Department of Fish and Wildlife.
As recently as 1944, two distinct species were prevalent: the brown rat (Norway rat) and the black rat (ship rat, roof rat). [4] Over the next few decades, the larger and more aggressive brown variety displaced the black rats, typically by attacking and killing them, but also by out-competing them for food and shelter. [5]
The latest chapter of New York’s centuries-long war on rats has the city throwing everything at the problem—from enforcing new garbage laws, to enlisting bands of vigilante rat hunters, to ...
Rat-baiting is a blood sport that involves releasing captured rats in an enclosed space with spectators betting on how long a dog, usually a terrier and sometimes referred to as a ratter, takes to kill the rats. Often, two dogs competed, with the winner receiving a cash prize.