Grey parrots use inferential reasoning based on acoustic cues alone – Arbeitsgemeinschaft Papageienschutz
https://www.papageienschutz.org/grey-parrots-use-inferential-reasoning-based-on-acoustic-cues-alone/Albanien Algerien Andorra Angola Antarktis Antigua und Barbuda Äquatorialguinea Argentinien