Reintroduced tapirs <i>Tapirus terrestris</i> recover their natural activity patterns

Abstract The lowland tapir Tapirus terrestris is confined to South America and is categorized as Vulnerable on the IUCN Red List. The species was extinct in the state of Rio de Janeiro in Brazil by the early 20th century but during 2017–2021, 14 individuals from six captive groups were reintroduced through a soft release method in the Guapiaçu Ecological Reserve in the Atlantic Forest. The reintroduced population was continually monitored with camera traps during the pre-release acclimatization period and after release. The released tapirs decreased the proportion of diurnal activity but did not decrease daily activity levels. Their activity patterns differed between the acclimatization period and post-release, as well as between the dry and wet seasons, but there was no difference between the activity of males and females. The tapirs modified their activity patterns over the course of the reintroduction period, showing an increasing resemblance to the behaviour of wild populations.