This item from last week's Earth Alert:

England's songbirds are forgetting how to sing, according to the Royal
Society for the Protection of Birds (RSPB). A spokesman blamed the
deteriorating trait on traffic noise that interferes with the birds'
ability to hear each other. The number of some species, including finches,
warblers, and orioles, has declined drastically because the birds are no
longer learning their mating calls. The RSPB said that instead of a
melodious song, all that some birds could manage to emit was a tweet.