About the logon images
These are the photos used as background in the 'splash-screen' window shown at program launch (they are used in random order).
        All images © Mark Chappell

Moonrise, Zion National Park, Utah.

Jaguar near Cocha Cashu station, Parque Nacional del Manú, Peru.

Dawn view from the White Mountains, California.

Andes near Machu Picchu, Peru.

Male blue-eyed darner, California.

Ibex Dunes, Death Valley, California.

Kolob Canyons, Zion National Park, Utah.

Afternoon storm, Joshua Tree National Park, California.

Western diamondback rattlesnake, California.

Central California coast at dusk.

Sunrise, Bolsa Chica wetlands, California.

Evening thunderstorm near Boulder, Utah.

Shiny beetle, Kansas.

Aspen leaves in autumn, California.

Dawn, southern California coast.

Datura blossom, California.

Leopard (Living Desert Reserve, California).

Thunderstorm over sagebrush, central Idaho.

Half Dome at dusk, Yosemite, California.

Reticulated python (captive).

Peregrine falcon feathers (a free-living bird), California.

Eastward view from the White Mountains, California.

Mountains in Torres del Paine, Chile.

Red diamond rattlesnake, California.

Denali, Alaska.

Peacock butterfly wing, Poland.

Blue columbine, Colorado.

Fall colors near Cedar Breaks, Utah.

Cheetah, San Diego Safari Park.

Peregrine falcon at nest site in La Jolla, California.

Sunset, Florida.

Rio Madre de Dios, Pantiacolla, Peru.

Eastern barn owl, north Queensland, Australia.

Green-winged teal feathers, Palo Alto, California.

Splendid wren, near Albany, Western Australia.

Surf scoter, Pacific Grove, California.

Summer storm over Two Peoples Bay, Western Australia.

Amazon basin looking east from the Andes, Peru.

Allen's hummingbird, California.

Bee in splendid mariposa lily, California.

Dulzura kangaroo rat, California.

Gambell's quail, California.

Granite spiny lizard, California.

Horned grebe, California.

Red-shouldered hawk (wild bird), California.

Clouds over San Gabriel Mts., California.

Winter beach sunset, Monterey Peninsula, California.

California bluebells, near Riverside, California.

Winter storm on the Big Sur coast, California.

Speculum (colored wing patch) of male mallard duck, California.

Sandhill cranes near sunset, Bosque del Apache, New Mexico.

Chuparosa blossom, Deep Canyon, Riverside County, California.

Snow plant, San Jacinto Mountains, California.

Winter willows and the San Bernardino Mountains, California.

Coachwhip (Masticophis flagellum), Salton Sea, Riverside County, California.

Sunrise reflection of San Jacinto Mountains, Riverside County, California.

Sanderlings, Monterey Peninsula, California.

Monterey pines in fog, California.

Himalayan monal feathers, California.

Mandarin duck, California.

Cadiz Dunes, southeastern California.

Sunset, Monterey Peninsula, California.

Cadiz Dunes, southeastern California.

Juniper at sunset, White Mountains, eastern California.

Male blue grosbeak in native sunflowers, California.

Sunset, Monterey Peninsula, California.

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