Behind the posterior eyes of a lycosid lies a tapetum lucidum, a mirrored layer that returns light through the retina a second time. The gain in low-light sensitivity comes with a side effect: a beam held close to the observer's own eye line comes back as a bright pinpoint, usually greenish, visible across many metres of open ground.
The trick is a working method. Ecologists census wolf spiders by walking transects at night with a headlamp, because the eyeshine is far easier to detect than the animal.
Maternal care in the family is unusual among spiders. The female attaches her egg sac to her spinnerets and drags it with her, and once the young emerge they climb onto her abdomen and ride there for days before dispersing. The bite is medically insignificant, despite the family's regular appearance in necrotic wound folklore.