{"fact":"Like humans, peer pressure can influence a young crow's tool use.  Their tool use was suppressed when tested in groups versus individually.","context":"We examined possible social-interference effects in a separate experiment, in which birds were tested both in their usual housing group (of 6–7 subjects) and individually. Tool-use behaviour was generally rare amongst ‘Alalā in their second year of life, irrespective of experimental condition, but it was clearly suppressed by the presence of group mates in subjects that were a year older.","source":"Christian Rutz; Barbara C. Klump; Lisa Komarczyk; Rosanna Leighton; Joshua Kramer; Saskia Wischnewski; Shoko Sugasawa; Michael B. Morrissey; Richard James; James J. H. St Clair; Richard A. Switzer; Bryce M. Masuda, Discovery of species-wide tool use in the Hawaiian crow, 10.1038/nature19103","index":8}