For many, however, this is a hot topic as some have suggested a direct connection between the presence of domestic cats and toxo-related infections in other animals, primarily land and marine mammals.

FORBES: House Cats Said to Lead to Car Crashes, Suicides, and Mental Disorders

It has just as much right to be on this land as all the other mammals.

NPR: Drilling to Begin in Colorado Ferret Habitat

If you go out from Earth up into space, you see our entire planet is a living organism - be it in the sea with all the fish, on the land with all the reptiles and mammals and insects, but the way man is behaving at the moment needs attention.

BBC: Norfolk - Chris Skinner's wildlife haven

The new air base would be built on reclaimed land there, where sea turtles and marine mammals called dugongs now swim around coral reefs in turquoise blue waters.

NPR: In Okinawa, Elections Renew Debate Over U.S. Bases

If the animals had reached Madagascar via a "land bridge" - meaning the landmass was connected to the African continent - Simpson argued that large mammals would have also made the journey.

BBC: Mammals 'floated to Madagascar'