BLACK widow spiders vary their webs to suit their purpose. A hungry spider spins a deadlier web, while a full one builds a fortress.
Spiders that were fed daily with crickets spun tangled masses of non-sticky silk, Jacquelyn Zevenbergen and Todd Blackledge at the University of Akron, Ohio, found. But similar-size spiders that had been starved for a week tended to spin sheets of silk connected to the ground by taut, sticky strands. When an insect blunders into these strands, they detach from the ground and spring upwards, suspending the prey in mid-air.
The sheet-like webs are better at transmitting…
