A copulatory tie usually applies to mammals, such as canids and felids, where the two animals are unable to physically part during mating due to the swelling, and structure, of the penis within the female's body (being barbed or lined with small "hooks" in some species).

[5] During brooding and chick-rearing, females shed their head feathers and develop bright orange skin coloration, and also sing complex songs from perches close to the nest.

[1] Feeds, in large, noisy flocks, on wild berries, fruits, nuts and seeds and also on cultivated maize, millet and rice.

[3] Greater vasa parrots in Lincolnshire Wildlife Park have been recorded using grinding technology – the first non-human animal to be observed doing this.

They were observed holding date stones and pebbles in their beak to grind calicium-rich dust from seashells.