Canadian researchers found that European birds flee before an approaching car at an interval that is consistent with the road’s speed limit, but not with the actual speed of the approaching car. So birds on a highway fled sooner than birds on local, residential roads. The researchers studied roads in three speed categories.

There are conservation implications for this finding, as an article in AAAS’s ScienceShot says.

Read the ScienceShot article here.
Read the abstract in Biology Letters, here. (Full article requires subscription or fee.)