"Colony of Rats"
"Horde of Rats"
"Mischief of Rats"
"Pack of Rats"
"Plague of Rats"
"Swarm of Rats"
Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea.
"True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus.
Many members of other rodent genera and families are also referred to as rats, and share many characteristics with true rats.