Aggregation of Euploea Butterflies in Sabah, Malaysia

Euploea butterflies aggregating in the Bandukan Park in Keningau, Sabah, Malaysia were sampled in August of 1987 to investigate their reproductive activities. Almost all females of the 3 dominant species, E. tulliolus, E. Sylvester and E. modesta had both mature eggs and spermatophore(s), which shows that they were active in reproductive activities unlike the monarch butterflies in overwintering colonies