Scientific investigations before and during the COVID-19 lockdown in Berlin in 2020 show that urban red squirrels are extremely flexible in adjusting their diurnal activities to the presence of humans, domestic dogs, domestic cats, and predators such as beech martens. With the help of wildlife cameras, scientists from the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) and citizen scientists recorded red squirrel activities in private gardens and properties over longer periods of time and compared them between the different times of day and seasons.