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家猪

Sus scrofa domesticus

猪能学会镜子里显示的是什么，并用它来找食物。

神经元: 22.2亿实测 · 全脑，一头家猪
Jelsing J, Nielsen R, Olsen AK, Grand N, Hemmingsen R, Pakkenberg B (2006) The postnatal development of neocortical neurons and glial cells in the Gottingen minipig and the domestic pig brain. J Exp Biol 209(8):1454-1462. doi:10.1242/jeb.02141. Whole brain: Kazu RS, Maldonado J, Mota B, Manger PR, Herculano-Houzel S (2014) Cellular scaling rules for the brain of Artiodactyla include a highly folded cortex with few neurons. Front Neuroanat 8:128. doi:10.3389/fnana.2014.00128.
在大脑皮层（或鸟类的外套）: 新皮层中 4.32亿（体视学）；分级计数法得 2.93亿
Jelsing J, Nielsen R, Olsen AK, Grand N, Hemmingsen R, Pakkenberg B (2006) The postnatal development of neocortical neurons and glial cells in the Gottingen minipig and the domestic pig brain. J Exp Biol 209(8):1454-1462. doi:10.1242/jeb.02141. Whole brain: Kazu RS, Maldonado J, Mota B, Manger PR, Herculano-Houzel S (2014) Cellular scaling rules for the brain of Artiodactyla include a highly folded cortex with few neurons. Front Neuroanat 8:128. doi:10.3389/fnana.2014.00128.

证据

猪能学会镜中影像代表什么，并用它来找食物。
Broom DM, Sena H, Moynihan KL (2009) Pigs learn what a mirror image represents and use it to obtain information. Anim Behav 78(5):1037-1041. doi:10.1016/j.anbehav.2009.07.027.

《纽约动物意识宣言》（2024 年）认为对哺乳动物和鸟类的意识体验有强有力的科学支持。