HI Murray,always fun to scan the roadside when on the highways. If U saw pairs,chances are they are birds that stayed the winter. This time of year the pairs sit close to each other alot. They will soon disappear from roadsides back to their breeding areas and get head starts. A pair Ive watched for 8 years has already started repairs to their old nest and guard their territory.
Migration does start this time of year for raptors. Ive been checking peak times lately so we can plan a few outtings for the gang to Beamer,to give us the best chance for big days. The last week of March/early April for one visit and Apr16-22 sometime.