Kenting's Purple Butterfly Frenzy: Rare Larvae and Pupae Cover Branches

Kenting National Park in Taiwan is currently hosting an extraordinary ecological spectacle: a massive surge in purple spotted butterflies. Favorable rainfall patterns this year have spurred an unprecedented breeding event, with host plants across the park, including areas near the park headquarters and the Nanwan coastal forest, now teeming with dense clusters of Common Imperial Blue, Lesser Purple Emperor caterpillars, and pupae. This high density has astonished onlookers, who describe the sight as "truly amazing."

Investigations by community monitoring partners and a research team from National Sun Yat-sen University revealed that several waves of spring rain first stimulated the abundant growth of tender leaves on host plants. This attracted overwintering adult butterflies to lay eggs, leading to a peak in caterpillar populations in May. Unexpectedly, the June plum rains brought further heavy precipitation, causing the plants to sprout new shoots vigorously. As female butterflies strongly prefer laying eggs on young leaves, this "dual incentive" of ample rain and food supply prompted a concentrated, frenzied egg-laying period.

Given that the development from egg to pupa for purple spotted butterflies takes only about 20 days, a rare ecological wonder of numerous caterpillars and pupae appearing simultaneously has emerged across Taiwan in late June. The research team noted a significant increase in the populations of *Euploea sylvestris* and *Euploea erycina*. If the weather remains stable in the coming weeks, without typhoons or heavy downpours, this large group is expected to emerge as adult butterflies sequentially.

Combined with subsequent generations emerging after the plum rains, Kenting anticipates a stunning peak of adult butterflies from early to mid-July. The nectar plants, such as *Clerodendrum inerme* in the Nanwan coastal forest and low-altitude shrublands, will witness thousands of purple spotted butterflies dancing and feeding, creating a magnificent scene that promises to be the summer's most captivating ecological highlight in Kenting. The park administration emphasizes that this "butterfly frenzy" demonstrates Kenting's high-quality habitat and urges visitors and photographers to strictly follow park regulations, refrain from capturing or disturbing the larvae and pupae, maintain a safe distance for photography, and avoid disturbing foliage. Safety is also paramount, especially for those observing near roads.

“

really amazing