Wolf spider mother and young (Pardosa vancouveri)
Wolf spider mothers go to great lengths to care for their young. Their egg sacs are made from several layers and kinds of silk, protecting the eggs from water, impacts, and other hazards. Once made, the mother will attach the sac to her spinnerets and carry it around wherever she goes. When the spiderlings emerge, they climb onto her back and secure themselves with silk. She continues to carry and protect them for some time before they eventually disperse.
Wolf spiders have very good vision and can be hard to photograph. Understandably, they're especially suspicious of photographers looming overhead whilst carrying young. I approached this one very slowly. It took several minutes to convince her I wasn't a threat and get close enough to photograph her.