Tortoises are a very popular pet within the UK, though they have extremely long lifespans, and will often outlive their owners. The most common species, Horsfields and Hermanns, are compact and don't grow too large. Some species, such as Leopard Tortoises, grow much larger, and will require a lot more space. Most tortoises are kept in tortoise tables rather than vivariums, due to the extra space and ventilation that they provide.