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Early April - Ospreys return to Calgary and select nesting sites Mid April - Mating and nest building April - Early May - Egg laying (two to four eggs) May - Incubation of eggs (Started) June - Eggs hatch July - Feeding and growing August - Fledging (Learning to fly) September - Osprey leave for warmer climate For over 20 years, osprey have nested at the Calgary Zoo atop a specially placed nest platform built and maintained by ENMAX Power.