Boulder's Open Space and Mountain Parks Department will close two areas on city open space on April 1 to protect the maternity colonies of local bats.

The east face of the climbing formation known as Der Zerkle will be closed until Sept. 1 to protect fringed myotis bats, while the area surrounding Mallory Cave will be closed until Oct. 1 to protect Townsend's big-eared bats.

Both bat species are considered sensitive to humans by state and federal agencies. Both species also face risks from white-nose syndrome, a disease that causes bats to become active during hibernation times, leading to the use of energy and fat stores and death.

Trespassing in the closed areas can carry a penalty of up to 90 days in jail and a $1,000 fine.

For more information visit osmp.org or call 303-441-3440.

The city also is recruiting volunteers to help monitor bat activity on open space.

Applications are available at osmp.org. Volunteer questions should be directed to Lisa Dierauf, OSMP's community outreach coordinator, at 720-564-2014.