CU Museum of Natural History and Facilities Management will be hosting their annual Spring Campus Tree Walks with Arborist Vince Aquino and Alan Nelson, retired outdoor services director. Two tours will be offered: the first from 5 to 7 p.m. on Tuesday, May 17, and the second from 5 to 7 p.m. on Wednesday, May 18. Tours are free and open to the public, and will meet at the south entrance of the CU Museum of Natural History at 15th and Broadway. Reservations not required. All ages are welcome.