RBSS-YOLOv8: multi-scale feature enhancement for high-density pig aggression detection - Longqin Xu; Shuyin Hu; Jinghui Yang; Zhuhong Che; Xuekai Gao; Huiyuan Pang; Tianyou Huang; Zhiyun Xu; Lichen Liang; Meng Cui; Shuangyin Liu (Computers and Electronics in Agriculture, 2026)