Its been about 20 years since Drusillas held these species, previously they had one or two cattle egrets and sacred ibis along with 2 white ibis in the aviary by the capuchins (now the colobus). These were replaced with little egrets and scarlet ibis in 1992/93, then these left when the ruffed lemurs occupied their enclosure.
I really miss the exhibit pictured when it was part of 'world of owls', it really was a fantastic exhibit in terms of education.