https://nature-mentor.com/chickadee-calls/
I had a dog that I taught American sign language. She understood dozens of signs, but didn't have the capability to 'speak' the language because ASL requires hands. But Koko the gorilla learned ASL, both receptively and expressively. She had a vocabulary of over 1,000 signs and could understand around 2,000 words of spoken English. Her sign vocabulary included basic signs like "food" and "drink", emotional signs like "sad" and "love", and more complex signs like "obnoxious" and "polite". Koko was also able to combine signs to create new meanings, such as calling a ring a "finger bracelet" and a mask an "eye hat".