Hi Folks..   My apologies for the delay. But, this pm  I found what appears to be a very good candidate for a SLATY-BACKED Gull (adult), in south Mississauga   It was located on a pebbly/sandy shoal at the mouth of the Cooksville Creek, just west of the RK McMillan Park parking lot. Will submit OBRC report.   Beware that people walk on the shoal and put up all the gulls. Directions:  There is a great deal of construction/paving on Lakeshore Bld east of Cawthra Rd. so, probably it is best to go:  QEW south on Hurontario (Hiway #10) to Lakeshore Bld; Left or east on Lakeshore to Hampton Crescent, just past the Cooksville Creek, South on Hampton Cr. to RK McMillan Parking lot. Walk west tomouth of the creek, gulls will sit on pebbly shoal at the mouth of the creek. Cheers Luc Fazio