As soils, air, and water temperatures warm, wondrous developments take place in the landscape. In this season of mud, life previously dormant activates, hatches, expands, emerges. On Saturday, April 7 at 11 am, biologist Bryan Connolly will speak about natural developments and interconnections taking place at this time of year in New England and then will lead a walk of discovery through various environments found at the Arnold Arboretum. Dress appropriately for outdoor exploration. Fee $10 Arboretum member, $20 nonmember

Register at http://my.arboretum.harvard.edu or call 617-384-5277.