The Seacoast Science Center in Rye is now handling marine mammal rescue duties in coastal New Hampshire. The center has joined the National Oceanic and Atmospheric Administration's marine mammal stranding network. The partnership began Jan. 1, but the busy season is likely to start this spring as seal pup season begins. Humans are more likely to encounter seals and seal pups on the beach at this time of year. The center reminds residents that most seals they encounter on beaches are not in danger. The center manages a 24-hour hotline for calls about animals that do appear in peril. Previously the New England Aquarium in Boston fielded stranding calls in New Hampshire. The science center asks resident to call 603-997-9448 with reports of strandings.