Ravens from Troja
The vocabulary of ravens counts about 30 kinds of their own expressions, or ravens words, including scale of intonations. Ravens can imitate voices of other animals - the dog barking, the chickling of hens, or stitching of doors, the motorbike startup and human speech. They master art of speaking better than parrots, can repeat not only words, but as well imitate intonation, or voice tember. The Great Raven is one of the largest singing birds and he returned to the Czech landscape last decenia. In Prague probably only in Troja Zoo, because they are rather shy and rather smart.