The Blue Heron "is the largest North American heron.... It has head-to-tail length of 91–137 cm (36–54 in), a wingspan of 167–201 cm (66–79 in), a height of 115–138 cm (45–54 in), and a weight of 2.1–3.6 kg (4.6–7.9 lb). In British Columbia, adult males averaged 2.48 kg (5.5 lb) and adult females 2.11 kg (4.7 lb)." Wikipedia
A large group of heron have been nesting at this time of year in Stanley Park for a few years now and they are there again this year. I have also seen a small group of herons gathering at Jericho park.
Could it be that a few have decided to set up house on this side of English Bay?