Amphibian larvae, commonly known as tadpoles, often gather in groups to avoid being eaten by predators. This behavior, called "social aggregation," suggests that these young animals have "association preferences"—a tendency to recognize and interact with members of their own species. Some species of tadpoles have been observed favoring their siblings, which has made the study of kin recognition and social behavior in these creatures an important area of research. Scientists are now exploring whether microorganisms in the water might influence how animals communicate, potentially shaping their social behaviors as well. However, the exact factors that determine whether social behavior is innate, shaped by early life experiences, or influenced by the environment remain unclear. To explore this, Kazuko Hase from Kyoto University conducted a study focusing on the Japanese common toad, Bufo formosus. She collected tadpoles from four different egg masses in the Botanical Gardens of the University of Tokyo, treating each group as a family unit. After hatching, the tadpoles were raised under different conditions: some were raised in tap water and others in pond water, while some were kept in groups with 20 siblings and others were raised in isolation. After two weeks, Hase tested their social preferences by placing them in tanks with sibling, nonsibling, and neutral individuals. She then observed how long the tadpoles spent in each zone over a 60-minute period. The results showed that the tadpoles did not show a preference for their siblings, regardless of their rearing conditions. This suggests that kin recognition might not be as important for social aggregation in this species as it is in some closely related amphibians. Tadpoles raised in isolation, however, were less likely to approach any other individuals, whether siblings or not, and spent more time in the neutral area of the tank. This indicates that social isolation has a strong effect on their behavior, even across different water environments. Hase found no significant differences caused by the type of water used. Hase's findings suggest that the social behavior of Japanese common toad tadpoles is more influenced by their social experiences than by their genetic relationship or the water environment. This insight contributes to a broader understanding of how amphibians develop social behaviors. The Japanese common toad is currently under threat of extinction, and Hase hopes this research will help in conservation efforts. She also expressed personal satisfaction in seeing these tadpoles, which she deeply admires, contribute to scientific knowledge.