humans and animals; humans and beasts
Refers to both humans and animals collectively, often in contexts like zoonotic diseases or coexistence.
Research on zoonotic diseases is advancing.
beast in human form
Figurative expression for a person who acts like a beast; often used in literary or rhetorical contexts. Related to the idiom 人面獣心.
See also: 人面獣心
His brutal actions are truly worthy of being called a beast in human form.
zoonosis
Compound of 人 (human) and 獣 (beast). The second sense is a figurative extension, possibly influenced by classical Chinese expressions.