There are a number of parrots in Nicaragua and Costa Rica and if you hear a discordant harsh noise it may be one or more parrots. The ones we have seen were always up in trees or flying. When we were in Fortuna we saw flocks of 20-30 flying but the owner said that in a few weeks there would be thousands in a flock! Didn’t get good pictures, in fact we never got really good pics of parrots in the wild but we did get these on a day trip on Ometepe in Nicaragua. They are probably Olive Throated Parrots and were about 30 feet up in the air.
I never knew how much noise a parrot makes; I don’t think I could stand to be around “thousands”!