The White Ibis is, well… entirely white in plumage. When spotted from a distance it can resemble a Great Egret, Cattle Egret or Snowy Egret, however the pink legs and face, along with the long, skinny downcurved bill is diagnostic. The tips of the wings are black, although that is only visible during flight. The juvenile has brown upperparts, and the neck is striped in brown and white, with gray legs and a darker bill. It is found in ponds and marshes in Guanacaste and the northern area of the country; also along the pacific coast of Costa Rica. Given its habitat, they usually wade in the shallow waters and mudflats, where pick small crustaceans and fish, just like Egrets do.
The Great Blue Heron is one of the largest birds that occur naturally in Costa Rica. They can be found in watery environments like rivers and ponds, even artificial ones like the one in Concasa, which has been visited by a juvenile bird almost every morning from January 2018 to March of the same year. The name is misleading though, as the blue is color is rather dull on this bird. The juvenile is mostly grayish, with a darker cap, yellow eye and lower mandible, and black upper mandible. The adult shows a light dull blue on the back and wings, with brownish neck and white cheeks, maintaining the dark cap and yellow eye, but the upper mandible changes to yellow. They stalk prey from the edge of water ponds and lakes, and launch a forceful attack as fish pass by, able to snatch fish of considerable size and swallow them in one go.
The Great Egret is a huge bird, measuring 1 meter from bill to feet. Its body is covered mostly on white plumage, with a bright yellow eye and bill, which is large and pointed, which helps to catch fish from rivers and ponds. Its long neck is most of the time coiled in an S-pattern. Its legs are black and very long, which helps to wade the shallow waters. Like most egrets, they inhabit the wetlands of Costa Rica, particularly at low altitude, and can be seen in rivers, ponds and small creeks. They stalk prey from the edge of shallow waters, standing still for minutes at a time while they observe their prey moving below the surface, and then launch their attack at the precise time to grab their prey.
From what I have observed, the Green Heron shares some traits with the bigger Bare-throated Tiger Heron. Both maintain their necks coiled most of the time, and elongate them up to twice the size of their body when they are ready to attack. Both walk in a stealthy manner, not making a single sound, as they approach to unsuspecting prey. Both are startled easily and fly far away when you are too close. The differences are that the Green Heron is more likely to be found perching high up in the trees, and the obvious size difference; the Green Heron is pretty small, the size of a duck, while the Tiger Heron is bigger than a turkey. They stalk prey while wading in shallow waters using their long feet and toes or from the water edge, sometimes standing motionless for minutes until they launch their attach and grab their prey.