Agonistic behaviour between pairs of hamsters of the same and opposite sex in a neutral observation area.
D000374:Aggression; D000818:Animals; D001835:Body Weight; D006224:Cricetinae; D004971:Estrus; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D012737:Sex Factors; D012726:Sexual Behavior, Animal; D012930:Social Dominance; D013997:Time Factors