Question

  What has happened to the birds?
from the lesson A short monsoon diary​

Answer 1

Answer:

In the fall of 2019, a report was released: over 2.9 billion birds have been lost since the '70s – that's 1 in 4 birds, and it's happening in every type of ecosystem. There are in fact many causes for the decline of birds. ... There's a reason the subject of the phrase “canary in the coal mine” is a bird