Cannibalism: Eating other individuals of one's own species.Cytophagocytosis: The engulfment and degradation of cells by other cells.Entosis: The processes by which one cell actively invades and becomes internalized within another cell.Biological Control Agents: Organisms, biological agents, or biologically-derived agents used strategically for their positive or adverse effect on the physiology and/or reproductive health of other organisms.Spiders: Arthropods of the class ARACHNIDA, order Araneae. Except for mites and ticks, spiders constitute the largest order of arachnids, with approximately 37,000 species having been described. The majority of spiders are harmless, although some species can be regarded as moderately harmful since their bites can lead to quite severe local symptoms. (From Barnes, Invertebrate Zoology, 5th ed, p508; Smith, Insects and Other Arthropods of Medical Importance, 1973, pp424-430)Paternity: Establishing the father relationship of a man and a child.Perches: A common name for fish of the family Percidae, belonging to the suborder Percoidei, order PERCIFORMES.Perciformes: The most diversified of all fish orders and the largest vertebrate order. It includes many of the commonly known fish such as porgies, croakers, sunfishes, dolphin fish, mackerels, TUNA, etc.Predatory Behavior: Instinctual behavior pattern in which food is obtained by killing and consuming other species.HemosiderinBeetles: INSECTS of the order Coleoptera, containing over 350,000 species in 150 families. They possess hard bodies and their mouthparts are adapted for chewing.