|Flock of geese on the Rideau (photo taken this time last year)|
Bird strikes are a hazard for pilots at this time of year. There were many geese at Rockcliffe airport today and while Chris was flying today he heard Air Traffic Control reporting signals from skeins of geese on their radar equipment. I spotted a long line of geese flying above the airport myself, pointing this out to some people from Germany, for whom it's a novel sight.
One of the ways in which the birds navigate, it seems, is to follow the course of rivers.
The weather is still warm so we were wondering how the geese know that winter is coming closer. We assume it is the shorter days and longer nights that make them feel restless to get going. The tree tops are changing colour now as well. Do geese have colour vision?