"Within the Talmud, this prohibition against unnecessary cruelty acquires a name — tza’ar ba’alei chayim: the suffering of animals" (source).

"I'm vegan because I think that all production of animal products today violate tza'ar ba'alei chayim."

"Don't kill that spider, just throw it out. It's tsaar baaley chayim!" (Glinert)