A new Javan rhino calf has been spotted in an Indonesian national park, the facility’s head said Friday, further boosting hopes for one of the world’s most endangered mammals after two other sightings this year. A new Javan rhino calf has been spotted in an Indonesian national park, the facility’s head said Friday, further boosting hopes for one of the world’s most endangered mammals after two other sightings this year. Plants & Animals Ecology Phys.org – latest science and technology news stories