Will a male betta fish kill another fish?

Male betta fish are known for their territorial and aggressive behavior towards other fish of the same species. They are highly likely to attack and kill another fish, regardless of gender, if they feel threatened or perceive the other fish as a rival. Betta fish should generally be kept alone in their own tanks to avoid conflict and ensure their well-being. Mixing betta fish with other fish often leads to aggressive encounters and potential harm to the other fish.