Siblicide is a rare phenomenon found in the animal kingdom where siblings kill each other. This act is usually seen among birds, animals, and insects when the availability of food and resources becomes scarce. But there are some synonyms used for siblicide such as fratricide which means the act of killing one's brother or sister, filicide which refers to the act of killing one's offspring, and infanticide which means the act of killing a young animal. These terms usually describe different forms of killing but are often linked with siblicide because all of them involve killing within the same family or species.