I don't know how many Great Egrets you have seen at one time in one place but on two recent trips to Thompson's Beach north of Adelaide in South Australia I've seen over 100 on each occasion. The details are on my blog:
https://www.ararelitus.com/birds-1
I'd appreciate any information on large sitings.
https://www.ararelitus.com/birds-1
I'd appreciate any information on large sitings.