The only unusual part of the recent spate of bird (and fish) die-offs is that people witnessed them.
Thousands of birds and fish have died in large groups over the last week.
Scientists say events like these are normal in the wild and are usually caused by weather or disease.
Most mass animal deaths occur far from human eyes, but that might change with development.
It has been a bad week for wild animals.
Starting just before the turn of the New Year, 500 red-wing blackbirds died together in Louisiana. Some 100 jackdaws turned up dead on a street in Sweden. And in Arkansas, an estimated 100,000 fish went belly-up the day before 5,000 blackbirds slammed into roofs, mailboxes and the ground at full speed.
Such massive, dramatic and high profile events have fueled concerns that nature is coming to an end, or at least that something weird and disturbing is going on in the animal kingdom.
But, experts say, massive die-offs like these are not at all unusual.
From bats to whales to bees to frogs, wildlife health experts say, major mortality events happen every year for reasons that include bad weather, disease outbreaks and poisonings. The main reason this recent spate of events seems so strange is that, most of the time, mass deaths occur in places where nobody notices them.