None of the five were neutered and they were allowed to breed freely with the other farm cats.

His dogs were allowed to breed freely and many had to be shot because there was no room on the ship to take them home.

Technology and science have degraded, and all freely breeding species have been exterminated.

True, with starships as weapons, North America need no longer accept forced immigration from freely breeding Third World countries.

We were allowed to breed freely on Middle Finger in case something went wrong with the grand experiment that was Man: billions of genetically identical non-individuals sharing a single consciousness.

Humans bred freely Earthside and anywhere they liked.

Wild mice breeding freely in semi-natural enclosures showed inbreeding avoidance.

Adults are easy to keep in aquaria for they rarely climb out if well-treated, and will breed freely in captivity.

Rexed cats were found at a farm in Saskatoon, Canada and had been breeding freely for around 10 years.

Until there was a final declaration on the question of sentience, no imported creatures were allowed to breed freely on planets under PEC control.