which researcher trained an african grey parrot to answer spoken questions with spoken words
Alex (parrot) Alex (1976 – 6 September 2007)[1] was an African grey parrot and the subject of a thirty-year (1977–2007) experiment by animal psychologist Irene Pepperberg, initially at the University of Arizona and later at Harvard University and Brandeis University. When Alex was about one year old, Pepperberg bought him at a pet shop.[2] The name Alex was a backronym for avian language experiment,[3] or avian learning experiment.[4]
Hyacinth macaw The largest parrot by length in the world, the hyacinth macaw is 100 cm (3.3 ft) long from the tip of its tail to the top of its head and weighs 1.2–1.7 kg (2.6–3.7 lb).[3][4] Each wing is 388–425 mm (15.3–16.7 in) long.[3] The tail is long and pointed.[3] Its feathers are entirely blue, lighter above. However, the neck feathers can sometimes be slightly grey.