Conclusion: The hosts and family conclude working on the yard, at which point shortly thereafter the family is presented with an NWF "Backyard Wildlife Habitat" plaque.
A study published in 2004 of the effect on Battus philenor in the San Francisco area found that gardens where the host plants were more than 40 years old, the gardens were as good as natural sites, where the host plants were less than eight years old the species was unlikely to visit, and in between the butterflies laid eggs but these had an inferior survival rate.
The Bird and Butterfly Garden was created in 1985 and has been accredited by the National Wildlife Federation as a certified Backyard Wildlife Habitat that is designed to provide food, shelter, water and nesting sites for wildlife.
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