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| WEEK 3
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| WEEK 4
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Each week there will be new wallpaper images to choose from. Step-by-step downloading instructions are below.
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Predators Then and NowArt by Matte FX
From "Sea Monsters," National Geographic, December 2005
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Among the last great marine reptiles, Tylosaurus, shadowed by an offspring, drives away a shark, Cretoxyrhina mantelli, in North America's Western Interior Seaway. Part of a group of carnivores called mosasaurs, whose fossils are found on every continent, Tylosaurus measured roughly 45 feet (14 meters) long. Gut contents from one beast suggest that it scavenged sharks and perhaps even attacked them. However, recent finds of Cretoxyrhina teeth embedded in mosasaur vertebrae indicate that the reptilian predator also became prey—or at least suffered its share of scrapes. Sharks proved themselves true survivors, outlasting the extinction of all the marine reptiles, except sea turtles, 65 million years ago, when volcanic eruptions, climate change, and a meteorite impact ended the reign of the reptiles.
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Click on your monitor size to download image:
15 inches (38 centimeters) or smaller
15 inches (38 centimeters) or larger
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Downloading Instructions:
Windows 95 or Higher
1. Determine which size is appropriate for your monitor.
2. Click the size you wish to download.
3. After the image appears in your browser, click the right-hand button on your mouse.
4. On the menu that pops up, select SET AS WALLPAPER or SET AS BACKGROUND.
Mac OS X
1. Determine which size is appropriate for your monitor.
2. Click the size you wish to download.
3. After the image appears in your browser, drag the image onto your desktop.
4. From the Apple menu select SYSTEM PREFERENCES.5. Select DESKTOP.
6. In the pull-down menu marked "Collection," select CHOOSE FOLDER.
7. Locate desired image file and double-click it.
Mac OS 9 or Lower
1. Determine which size is appropriate for your monitor.
2. Click the size you wish to download.
3. After the image appears in your browser, drag the image onto your desktop OR click and save the image to your desktop.
4. From the Apple Menu (at the top left of your screen) select CONTROL PANELS, then DESKTOP PICTURES or APPEARANCE. (If the new window reads APPEARANCE, select the tab that reads DESKTOP.)
5. If necessary, click REMOVE PICTURE to clear the current desktop picture.
6. Click SELECT PICTURE or PLACE PICTURE. A new window will pop up.
7. In the new window, use the pull-down menu at the top and select DESKTOP. Find the desired image in the file list and double-click it. The window will close.
8. In the APPEARANCE window, select SET DESKTOP.
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