Is it feasible that these birds may have preyed on diseased (released) smaller birds i.e. munias, particularly in areas such as Tuen Mun park?
The larger heron species(Grey Heron, Great Egret) and Buzzard would almost certainly prey on smaller birds I would think having seen Grey Herons prey on small mammals back in the UK. Not sure if the Little Egrets or Night Herons would prey on smaller birds though - perhaps others have seen evidence of smaller birds in the diets of the smaller ardeid species - I'd be interested to hear.
I think the Society and members have an important part to play in the monitoring/reporting/education of this subject, to echo comments in other threads.
