Este é "The Monsters", de Robert Sheckley. É a matéria principal da coleção " Loja dos Mundos ", além de aparecer em alguns outros lugares .
'Shall we go down and have a closer look?’ Hum asked.
‘All right. I think we have time — wait! What day is this?’
Hum calculated silently, then said, ‘The fifth day of Luggat.’
'Damn,’ Cordovir said. ‘I have to go home and kill my wife.’
'It’s a few hours before sunset,’ Hum said. ‘I think you have time to do both.’