With our young children, we appreciate visiting those sizeable places. The guided English-speaking tour lasts about half an hour and answers many children's questions about eggs, caterpillars, and coccoons. The small garden is beautiful, filled with colorful flowers and butterflies, a playground for kids with its interlaced paths, miniature ponds and swinging armchairs.
The entrance fee is 4USD per adult, 2USD per child, babies enter for free.
More info: http://www.angkorbutterfly.com/bbchome.html