A new study published in the journal Scientific Reports provides empirical evidence for deliberate self-care tooling in a species of bird. Photographs of Bruce handling objects larger than his preening pebbles, namely: (a) a slice of carrot, (b) a stone, (c) a piece of bark, (d) a black token used in previous cognitive experiments he was a part of; a close-up image (e) demonstrates how he uses his tongue and lower mandible to hold these objects. Image...
