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Odonates are dragonflies and damselflies that are associated with water. As flying adults, they are carnivorous that prey on other insects. Their name comes from the Greek word odṓn meaning “tooth”—even though it is now known that their strong mandibles (jaws) do not have teeth but rather serrations.
Dragonflies are fairly... more >>
When observing animal species, the sexes often can be determined by noting differences in coloration, size, features, and even behavior. For example, male elk grow antlers, while females do not; in lions, the males have a mane, and the females do not. Among higher vertebrates, one manifestation of this “sexual... more >>
Golden Gate, meet silver screen. With the Oscars coming up (Feb. 24), we’re handing out (figurative) statuettes to the most memorable movie scenes filmed in the Golden Gate National Parks.
We also want to hear from you! “Comment” below and share with us your favorite movies or scenes that feature these... more >>
Around 1882, a small boy huddled on a beach south of Sausalito watched his father swim his morning regimen in San Francisco Bay. The man cut through wavelets until he reached a buoy. Tapping it, he exchanged a “hi” sign with his much-relieved son, and then swam back.
Poet Robert Frost... more >>
I wrote an earlier article on the background of the Hawk Hill restoration issue and its ecological intricacies (December 2011 Park E-ventures article), but here I wanted to address the big question that I heard only a few hundred times this autumn: what happened to the hawks as a... more >>
On September 27, 2012, on Hawk Hill, we counted 295 Broad-winged Hawk sightings, 10 times our previous one-day count for that species. We even exceeded our season-total record—248 sightings—in just that one day. Why is this exciting?
Broad-winged Hawks are soaring hawks that nest throughout the eastern broad-leafed forests. They do... more >>
This season, the GGRO is able to use brand-new technology to help us track bird movements. On Friday, August 23 we put out a GSM (cell phone) transmitter on a female juvenile Red-tailed Hawk, nicknamed Augusta. This device utilizes a GPS device, similar to a hand-held or car GPS unit,... more >>
Throughout the 1980s–90s, the GGRO Peak Week—that is, the seven-day stretch that contained the highest hawk count days of the year—truly happened in a week (or roughly a week). In those not-so-ancient times, we recorded highest count days as early as September 15 (569 sightings in 1987) and as late... more >>
By Robyn Smith, GGRO Intern
For many visitors to the Marin Headlands, the main draw to Rodeo Lagoon may be a willow-lined walk to the beach, a picnic by the historic buildings of Fort Cronkhite, or a chance to watch some interesting wildlife.
In August, the east end of Rodeo Lagoon... more >>
To build excitement for National Trails Day on June 2, we are putting you to the (trail) test. Flex your brain muscles to identify the park and the trail in the photos below and discover what type of trail aficionado (or not!) you are. (Scroll down... more >>