Monk Parakeet colony (Pasir Ris Park)

I been to Pasir Ris Park many times and on the way there, i will pass the Pasir Ris Sports Centre's swimming complex (if you use the park connector). Up the light tower, there is a huge nest. For the longest time i thought the nest was made by Grey Heron. Recent posting on the various bird groups of Singapore facebook pages, it was highlighted that this were the nest of Monk Parakeets also known as Quaker Parrots. Monk Parakeets like many parrots and parakeets were introduced to Singapore as pets. Some this parakeets have thrived over the years and spread all over Singapore and have been also added in the Singapore Bird Checklist. At the moment, Monk Parakeet is not in this list..but who knows one day it might. Reading further about Monk Parakeets, i found out that Monk parakeets have interesting nesting behaviour. – they are the only known parrots in the world that builds nests out of branches rather than nesting in cavities. Their nest unlike the usual nest we see are fully enclosed with many nesting chambers constructed within. The number of nesting chambers in a nest usually varies from 2 to 20, each housing a pair of parakeets. But they can grow to be quite massive like the one in Pasir Ris Park Tower. I counted over 6 Monk parakeets living in this colony. There could be more, but i am not sure.