N4N Tilden Regional Park Bioblitz. BERKELEY, CA. April 20, 2014. Nerds embarked on two forays into Tilden Park this past Saturday. There were lots of insects and other arthropods to be seen. Even more impressive than the insects was the preparedness and enthusiasm of this nerdy band of insect photographers. Some of the photos from this insect survey will be used to create Insects of the San Francisco Bay Area.