The virus has spread to over 710 dairy herds across 15 states, with California reporting the highest number of infections. At least 58 people have been infected with bird flu, including one child.

Health officials say there's very little risk to humans from the bird flu outbreak among dairy cattle, but there's still much they don't know. Here are four questions scientists are trying to answer.

The snake-like amphibian is native to Brazil. Researchers say the milk in many ways resembles that produced by mammals.

Food and Drug Administration officials have issued guidance that says plant-based beverages don't pretend to be from dairy animals – and that U.S. consumers aren't confused by the difference.

Actor and activist James Cromwell glued his hand to a midtown Manhattan Starbucks counter on Tuesday to protest the coffee chain's extra charge for plant-based milk.