Transcripts for KPIX CBS Evening News With Scott Pelley 2013

arboretum in short hills, new jersey are, getting their first glimpse at one of the marvels of nature. >> i see a lot of holes. oh, you found one! >> they're disgusting! >> reporter: like clockwork, the cicadas, who belong to what scientists call brood 2, are digging their way out. >> so this is a cicada hole and there is a cicada nynph. he has studied the life cycle of cicadas for 20 years. >> they synchronize their development, and they have long life cycles and when they come out they come out in massive numbers. >> reporter: what is triggering that? >> well, they are counting the seasons because they are down underground feeding on the roots and count the number of times it leaves out, and they monitor soil temperature and when it hits 64 degrees fahrenheit out they come. >> the eastern united states an estimated 1 million cicadas per

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