The migration path of the monarch butterflies is quite amazing. They are the only insects that migrate to places that are 3,000 miles away. From October to January the monarchs visit the Bay Area. Last week I named Ardenwood, the historic farm in Fremont, as one of the places you can see monarchs.
Another special place to see them is the Natural Bridges State Beach in Santa Cruz. They created a boardwalk for people to observe and learn about the butterflies. For some reason the clusters are at Lighthouse Field State Beach, two miles away from the Natural Bridge State Beach.
In an eucalyptus tree hundreds of them bundle together and warm each other. 
They look like brown leaves, but when it gets warmer they start flying off. The monarchs need a temperature of over 55F to be able to fly.
Some monarchs live for only four to six weeks, while others live six to eight months and have to fly really far to escape the cold weather. What is amazing is that the fourth generation returns to the places the first generation came from.
Have you seen a cluster of monarchs before?