On the Greek islet of Formicula, researchers have found rare Mediterranean monk seals will take refuge in an air-filled “bubble cave,” according to a recent study. This type of hidden chamber, accessible via underwater passages, allows the seals to breathe, and possibly hide from tourists, the researchers said. Mediterranean monk seals (Monachus monachus), the world’s rarest pinniped, are the only seals found in the Mediterranean Sea. Fewer than 1,000 of them remain, according to the IUCN, the global wildlife conservation authority.     Historically, these seals hauled out on open coastal beaches to rest, molt and give birth to pups. But with increasing human disturbance from tourism, fishing and land development, they retreated to marine caves along the Mediterranean coastline to rest and breed. Study lead author Joan Gonzalvo of the Ionian Dolphin Project at the Tethys Research Institute in Italy described the “ideal cave” to Mongabay as one with a pool, a dry beach for hauling out, an entrance corridor and protection from adverse weather and choppy seas. Typically, these caves are accessible by entrances above or below water level. During a habitat assessment in the Inner Ionian Sea Archipelago, the team was setting up a camera to monitor one of these “comfortable” marine caves on Formicula when they discovered that an underwater corridor connected to it led to a second smaller chamber. This “bubble cave” had water and a pocket of air on top, but no dry beach or platform to haul out. The team placed an underwater camera in the…This article was originally published on Mongabay

Platypuses reintroduced to Australia’s oldest national park are breeding and appear to be on a good population trajectory with 20 known individuals now, scientists say. For more than 50 years, the platypus (Ornithorhynchus anatinus), a semiaquatic, egg-laying mammal, had been absent from Royal National Park, a protected area located just south of Sydney in the Australian state of New South Wales. A reintroduction program was initiated in 2023, led by Gilad Bino from the University of New South Wales (UNSW) and a co-founder of the Platypus Conservation Initiative. “It is a privilege to be part of bringing platypuses back to a part of their former range where they had been missing for generations,” Bino said in a statement. In 2023, researchers first introduced a founding group of 10 platypuses to the Hacking River that flows through the national park. A second group of three animals followed in 2025. Each animal was fitted with a transmitter to allow scientists to monitor their survival, movements, and breeding. In May 2026, researchers introduced four more platypuses sourced from healthy populations: two males they named Absinthe and Duckie, and two females they named Dawn and Hydra. At the same time, the researchers carried out extensive surveys and found 20 known individuals. More individuals could be present that were missed. Researchers Gilad Bino and Tahneal Hawke during a platypus survey in Royal National Park. Image courtesy of Gilad Bino/Platypus Conservation Initiative. Visitors are also reporting platypus sightings in the park, especially around the river. “That public connection…This article was originally published on Mongabay