After Tusken Raiders attack his farm, Uncle Owen decides to buy some nexus as guard animals. He purchases five nexus, but soon realizes that the cost of feeding them is just too expensive. So he piles them into his landspeeder and travels to Mos Eisley, with the intention of selling them.
When he gets to Mos Eisley, he visits all of the local pet stores, but nobody wants to buy the nexus. Finally, a shady Toydarian merchant offers a deal. “Listen,” he tells Owen, “I happen to notice that all of your nexus are female. And I happen to own five male nexus. Let’s get our nexus together, raise a nexu farm, and split the profits.”
It’s not what he had in mind, but Owen figures it’s better than nothing. So he speeds over to the Toydarian’s house, and lets his nexus do their thing with the male nexus.
Afterwards, as he puts his nexus into the landspeeder, the Toydarian flutters over to him. “If they’re not pregnant in a week,” he says, “bring ‘em back and we’ll try again.”
“How will I know if they’re pregnant?” asks Owen.
“Nexus are very predictable,” responds the Toydarian, “if they’re pregnant, they’ll be huddled together in the shade. If they’re not, they’ll be roaming around in the sun.”
So Owen goes home, waits a week, then on the seventh day, looks outside to see his nexus roaming around in the hot desert sun. “Guess they’re not pregnant,” shrugs Owen, and he piles them back into the landspeeder for another trip to Mos Eisley.
After that trip, Owen goes home and waits another week. On the seventh day, he’s relaxing in his favorite chair when he remembers the nexus. “Hey Beru,” he calls into the next room, “can you look out the window and see if the nexus are in the shade or in the sun?”
Beru goes to look. “Neither,” she calls back, “they’re sitting in your landspeeder, and one of them is honking the horn!”