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The gate is perfectly simple," Temeraire said. "There is only a bar across the fence, which one can lift very easily, and then it swings open; Nitidus could do it best, for his forehands are the smallest. Though it is difficult to keep the animals inside the pen, and the first time I learned how to open it, they all ran away," he added. "Maximus and I had to chase after them for hours and hours--it was not funny at all," he said, ruffled, sitting back on his haunches and contemplating Laurence with great indignation.

Naomi Novik (2009). “In His Majesty's Service: Three Novels of Temeraire (His Majesty's Service, Throne of Jade, and Black Powder War)”, p.390, Del Rey
The gate is perfectly simple, Temeraire said. There is only a bar across the fence, which one can lift very easily, and then it swings open; Nitidus could do it best, for his forehands are the smallest. Though it is