The calaos are hornbills in Spanish, and yes they are amazing birds, incredibly popular in zoos, and as 99% percent of all bird species are currently missing from the game. It will be very interesting to see how Frontier approaches this, as much faith as I have in them, I can see them pulling this one off, unless a completely different approach to the current DLC format is implemented. Birds account for the majority of species in almost every zoo, the only major zoo in the world that I have visited that had a moderate collection, was Singapore Zoo, and that is only because the had the second largest bird park in the world and had most of their collection there. So many birds, it opens the possibilities for inclusions to wide for Frontier. Just thinking about hornbills, I could fill up almost an entire three years worth of content.