Geometry for the selfish herd.
D000818:Animals; D001001:Anura; D001522:Behavior, Animal; D005075:Biological Evolution; D001947:Breeding; D003142:Communication; D005239:Fear; D008669:Metallurgy; D008954:Models, Biological; D011336:Probability; D012911:Snakes; D013037:Spatial Behavior