TY - RPRT TI - Welfare at group and individual level: optical flow patterns of broiler chicken flocks are correlated with the behaviour of individual birds AU - Gebhardt-Henrich, S. AU - Stratmann, A. AU - Dawkins, M. S. PY - 2021 DO - 10.1101/2021.01.19.427267 UR - https://www.biorxiv.org/content/10.1101/2021.01.19.427267v1 ID - 10.1101/2021.01.19.427267 ER -