The Behavioural Sink Wikipedia page doesn't list any independent replications, though Calhoun studied the phenomenon from 1947--1995, a period of 52 years.
I'm going to emphasize independent replication as having the same principle investigator study a question doesn't meet that bar. The failure to replicate (or of Wikipedia to note any replication which might exist) is curious given the notoriety and significance of the Rat Utopia studies.
The Behavioural Sink Wikipedia page doesn't list any independent replications, though Calhoun studied the phenomenon from 1947--1995, a period of 52 years.
I'm going to emphasize independent replication as having the same principle investigator study a question doesn't meet that bar. The failure to replicate (or of Wikipedia to note any replication which might exist) is curious given the notoriety and significance of the Rat Utopia studies.