Nesting Season of the Scarlet Ibis is On! The ebb and flow of the scarlet ibis population in the Caroni Swamp is an annual occurrence that can cause alarm for those who are unaware of what is happening. The Forestry Division which has been monitoring population size of this national bird for over twenty years has recorded up to 18,000 birds in the peak period, which drops off to as low as 2,000 during the nesting season which is now. Visitors to the Caroni Swamp are now witnessing the low number