        Obviously, he should reciprocate.  He looked at his two sandwiches thoughtfully.  He could offer her either.  Of course, terrestrial horses were herbivores, so the roast beef was probably not an option.  He looked at it guiltily—was he offending her by having it?  But what if she was insulted if he chose?  And how could he assume that they weren’t omnivores?  He’d never seen a terrestrial horse eat a sandwich of any type.  He didn’t even know if they would eat a sandwich, if offered one.