‘The point I’m trying to make,’ he said, brightening, ‘is the dolphins. That’s my point.’ ‘Kind of fish,’ said Aziraphale. ‘Nononono,’ said Crowley, shaking a finger. ‘’S mammal. Your actual mammal. Difference is—’ Crowley waded through the swamp of his mind and tried to remember the difference. ‘Difference is, they—’ ‘Mate out of water?’ volunteered Aziraphale.