Do female black widow spiders kill and eat their mates after sex?

Sometimes. What makes them decide to do so is uncertain.

Who played the object of Lon Chaney’s affections in The Phantom of the Opera (1925)? Mary Philbin was Christine Daae, protegee of Erik, the Phantom (Chaney) in The Phantom of the Opera (1925).
What was the name of the Broadway play with which Zero Mostel and Gene Wilder tried to fleece their investors in The Producers (1968)? The name of the Broadway play in The Producers was Springtime for Hitler. Nazi refugee Franz Liebkind, played by Kenneth Mars, was the play's author.
What state did Joseph McCarthy represent in the Senate? Joseph McCarthy represented Wisconsin in the Senate. The Republican senator, famous for his investigations of alleged communists, served in the Senate from 1946 to 1957.
Which came first, Omoo or Typee? Melville's novels of the South Seas were published in this order: Typee in 1846, Omoo in 1847
What is the difference between a crocodile and an alligator? The alligator is a subspecies of the crocodile, part of the family Crocodylidae. The alligator's snout is rounded; the crocodile's comes to a point. Both prefer shallow, swampy water, but the crocodile is…
Which dogs bite the least? The following dogs bite the least: 1. Golden retriever 2. Labrador retriever 3. Shetland sheepdog 4. Old English sheepdog 5. Welsh terrier