A shekara ta 2012, wani rukuni na sanannun masana kimiyyar kwakwalwa sun bayyana a cikin "Sanarwar Cambridge game da Sanin a cikin Dabbobi Ba-Mutum ba" cewa dukkan dabbobi masu shayarwa da tsuntsaye (kamar dabbobi masu shayarwa), da sauran dabbobi, suna da kayan aikin jijiyoyin da ke haifar da hankali kuma suna iya fuskantar yanayin motsin rai. Eugene Linden, marubucin littafin The Parrot's Lament, ya nuna cewa misalai da yawa na halayyar dabbobi da hankali suna nuna duka motsin rai da matakin sani wanda za mu danganta shi ne kawai ga jinsinmu. Tambaya: Menene masana kimiyyar kwakwalwa suka ce?
dukkan dabbobi masu shayarwa da tsuntsaye (kamar dabbobi masu shayarwa), da sauran dabbobi, suna da kayan aikin jijiyoyin da ke haifar da hankali kuma suna iya fuskantar yanayin motsin rai