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Hares and rabbits are not interchangeable. These two European hares, sometimes simply called brown hares, are larger than rabbits. All hares are. They’ve longer legs, ears, and a rangier build, which is better suited to their life above ground. For while rabbits gather in social groups called ‘herds’ and nest underground in warrens, adult hares are solitary for most of their lives, sleeping above ground in their grassland and prairie habitats. Hares are also quite fast: European hares can sprint at 43 miles an hour.