This is the 12613th most frequent German word.
wellensittiche
"Wellensittiche" means "budgerigars" or "budgies" in English.
Here, 'Wellensittiche' is plural for budgerigars, demonstrating their general behavior.
Die Wellensittiche zwitschern laut in ihrem Käfig.
The budgerigars chirp loudly in their cage.
In this sentence, 'Wellensittiche' refers to a specific observation of these birds in a location.
Ich habe gestern Wellensittiche im Park gesehen.
I saw budgerigars in the park yesterday.
Here, 'Wellensittiche' is used to denote items (budgerigars) sold at a pet shop.