Like clockwork, tens of thousands of crows, also known as a murder, come together this time of year for their own safety. They’re noticeable in downtown Rochester. Genesee Valley Audubon Society President June Summers said it's a way to protect themselves from predators, like owls. She said the crows are often distant relatives. “Crows come together in a winter roost, in numbers because it's safer,” said Summers. “In the spring and the summer they disperse and go out and nest, and take up