It's Thanksgiving, and time to be grateful.

In the bug world, we're all grateful for the people who study insects, monitor them, and share information to impart scientific data and help save declining species.

Take butterfly expert Art Shapiro, professor of ecology and evolution at the University of California, Davis (of Art's Butterfly World).

How he does it, we'll never know, but he has monitored butterflies in the area for more than three decades and knows when a population is declining or increasing.

On a trip to Vacaville on Nov. 12, Shapiro discovered six gulf fritillaries (Agraulis vanillae) in gardens on Buck Avenue, and one at the base of Gates Canyon (that's only the second he's seen; the first he saw in May of 1984).

That's great news!

"I suspect the colony has expanded into the upscale hillside neighborhood off Foothill but had no time to go looking," Shapiro commented.

Meanwhile, he says, there are fewer gulf frits in Sacramento this year than in the last two years.

The gulf frit is one of the showiest butterflies in California. The bright orange-red butterfly, with a wingspan that can reach four inches, was first recorded in the Bay Area before 1908. Shapiro says it became established there only in the 1950s.

The last time we saw gulf frits in Vacaville was a couple of months ago, on Sept. 14. They were all over a passionflower vine (Passiflora)--the adults, the pupae, the larvae and the eggs--in a Buck Avenue garden. Later we saw several nectaring lantana.

Now they appear to be expanding their territory in Vacaville. 

We all ought to be attracting them! The larval hosts include passionflower vines, such as the maypop (Passiflora incarnata), blue passionflower (P. caerulea), and corky-stemmed passionflower (P. suberosa). As an adult, the gulf frit nectars on such plants as lantana (Lantana camara), tall verbena (Verbena bonariensis), pentas (Pentas lanceolata), drummond phlox (Phlox drummondi) and something called "tread softly" (Cnidosculous stimulosus).