- 同类意识 tónglèiyìshi consciousness of kindIn psychology, the awareness that others share similar characteristics or behaviors with oneself, leading to a sense of belonging to the same group.
- 同类相吸 tónglèixiāngxī like attracts likeUsed to describe how people with similar interests or characters are naturally drawn to each other.
- 同类相残 tónglèixiāngcán infightingto harm or kill members of one's own kind; an intramural fight or struggle
- 同类相食 tónglèixiāngshí cannibalismthe practice of eating individuals of one's own species