The researchers considered the neural and hormonal differences between the rodent species that form inseparable pairs and those that prefer to go it alone.

"The world is a Noah's ark on the sea of eternity containing all the endless pairs of things, irreconcilable and inseparable," Arbus said in a letter to a friend.

Lucas once noted that Darwin tended to follow him around, and that they were something of an inseparable pair.

The two of them made an inseparable pair, even when they were not winning field trials cups.

Abahachi (Michael Herbig) and his blood brother Ranger (Christian Tramitz) are an inseparable pair since Ranger saved Abahachi from a speeding train on an unguarded railroad crossing.

Further along the coast is the inseparable pair, Lynton and Lynmouth, the former famous for its herd of wild goats, the latter for its excellent, if challenging surfing and history as a herring port.

The Dumplings are an inseparable pair.

Mr Goult's nephew, John Goult, who already has a guard dog at his home in Esthwaite Avenue, St Helens, said: 'They were an inseparable pair.

"We hope to have a preliminary report ready for the April board meeting," Difficult Questions For 16 years the center and Roger L. Stevens, its founding chairman, were an inseparable pair.

They were an inseparable pair with impeccable reputations in the industry for the quality of their developments and for their integrity and honor.