Sulphur breasted toucans have zygodactyl feet because they spend a large portion of time in the trees. This helps the birds to stay on the branches of the trees and hop from one branch to another.
When courting, male and female toucans may toss fruits to each other, throwing and catching them in their beaks. Their bills are of a honeycomb construction, which makes it light and of no use as a weapon. They are tree-hole nesting birds and like many hole-nesting species, the eggs are white in colour and the chicks when they hatch are not well developed; they are not feathered and have closed eyes. The incubation period lasts around two weeks and the chicks’ eyes open three weeks after hatching. The young fledge the nest after a further three weeks.