Besides their gigantic size, another thing should be noted about Hyacinths, they are specialized feeders. Hyacinths eat the nuts of the Scheelea Palm and the Atalea Palm in the wild. In captivity, they are fed macadamia, Brazil, filbert, walnut, almond, pecan, peanuts and coconuts, because they do require more fat and carbohydrates and less protein than other parrots. The diet is supplemented with fruits, vegetables and pellets. As an interesting aside, it takes nearly four months to wean a baby Hyacinth.
Hyacinths have a wingspan reaching nearly four feet.
This needs to be taken into consideration when planning for a cage. They need a great deal of space. As far as dispostion goes, generally, these birds are sweet, gentle, affectionate and even-tempered. The Catalina is a hybird between a Blue and Gold and a Scarlet Macaw. The Harlequin Macaw is a cross between a Blue and Gold and a Greenwing Macaw.