Nghiên cứu khẳng định loài chó thực sự biết rơi lệ vì cảm xúc
Theo các nhà khoa học, phản ứng khóc ở loài chó có được nhờ lịch sử thuần hóa lâu dài, có vẻ như loài người đã phát triển một mối quan hệ chặt chẽ, gắn bó với chúng hơn hẳn những loài vật khác.
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