A Colorado brown tarantula (Aphonopelma hentzi) on the move at twilight. Each autumn, Colorado’s brown tarantulas emerge from their burrows and wander across the plains in search of mates. Males, ...

Each year, male brown tarantula trek across Colorado to look for ladies. From mid-September to mid-October, they leave the safety of their burrows to go on journeys that will take interesting turns as ...

Just before sunset, as baseball-sized tarantulas cross the road at Colorado’s Southern Plains Land Trust, two biologists quietly exit their car to scoop up a few of these eight-legged pedestrians.