General view of the otters of the Lisbon Oceanarium, on August 30, 2021 in Lisbon, Portugal. The Lisbon Oceanarium is a public aquarium that usually receives more than one million visitors a year. Due to the COVID-19 pandemic, it has implemented a reduction in the number of visitors, carrying out frequent cleaning actions of spaces and mandatory use of masks during the visit. (Photo by Nuno Cruz/NurPhoto/Rex Features/Shutterstock)
