As seals begin to flock to Whanganui beaches, the Department of Conservation is asking the public to give them space and leave them be.
Although seals are marine mammals, they spend a lot of time on land, particularly between July and November.
Rough weather conditions can encourage them to seek shelter on shore and occasionally follow rivers upstream.
DoC senior biodiversity ranger Sara Treadgold said this behaviour was normal.
"We receive calls from the public each year from people concerned about a seal they've seen," she said.