For one study, Lowe attached sensors to fish living by three oil platforms, before moving them to a natural reef located up to 18km (11 miles) away and monitoring their movements over two years. A quarter of the fish, across all species, quickly returned to their home oil platform, while others would migrate back during non-breeding seasons. "They had a higher likelihood of going back to their original platform than somewhere else. They really like their home platform. This showed us a lot about how the fish treat the platform as a habitat," says Lowe.