Death of a Heron Rookery. Top photo in the composite was taken in 2014 and the one below was from 2018. Both were taken in Bruce Street wetland in Keswick, Ontario. Back in 2014 the trees were full of Great Blue Heron nests - there were probably more than 100 nests in that area, each tree supported multiple nests. Over the years flooding from nearby farm fields felled the trees and by 2018 the area became devoid of nests - the rookery is no more, a complete wipe out in four years. Nature Canada puts Great Blue Heron in 'Special Concern' category, yet not much is conserved in this conservation area. It is sad to see the decline of a rookery in such a short time.