President Donald Trump will deliver remarks during this year’s observance ceremony at Flight 93 National Memorial in Pennsylvania on the anniversary of the September 11 terrorist attacks.

Though volunteers help out public lands throughout the year, once a year everyone is invited to lend a hand. This year National Public Lands Day falls on September 22, and there will be events across the country, and the National Park System, looking for volunteers.

National Park Service staff, who have been asked to relax sport hunting regulations for wolves and bears in national preserves in Alaska, are relying on the state of Alaska's position that increased hunting of the predators will not have an overall impact on their populations. But the regulatory changes likely would reduce opportunities for wildlife viewing and degrade wilderness character in the preserves, the Park Service adds in an assessment of the rule changes.

A litter of four mountain lion kittens, two males and two females, found in a remote area of the Santa Monica Mountains is likely the result of inbreeding, according to National Park Service biologists.