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Terrestrial Origins and Evolution
Extinct, Dinosaur Diorama
Viewed: 3334 times
01/14/09
Extinct, Seacow (Dugong)
Viewed: 2335 times
01/14/09
Asteroid Catastrophe or Interplanetary Seeding?
Viewed: 2329 times
01/14/09
Martinique Lizard (Leiocephalus herminieri), extinct
Viewed: 2415 times
01/14/09
Extinct, Mammoth
Viewed: 2022 times
01/14/09

Extinct, Giant Sloth
Viewed: 2117 times
01/14/09
Extinct, Ivory Billed Woodpecker
Viewed: 2276 times
01/14/09
Endangered, Rhino
Viewed: 1990 times
01/14/09
Extinct, Dodo
Viewed: 2063 times
01/14/09
Ornithomimus or bird-like dinosaur, extinct
Viewed: 1845 times
01/14/09

Round Island Boa (Bolyeria Multocarinata), extinct
Viewed: 1963 times
01/14/09
Brachiosaurus, extinct
Viewed: 1847 times
01/14/09
Tyrannosaurus, extinct
Viewed: 1701 times
01/14/09
Carolina parakeet (Conuropsis carolinesis), extinct
Viewed: 1938 times
01/14/09
Extinct, Pink-headed ducks
Viewed: 1612 times
01/14/09

Extinct, Passenger Pigeon
Viewed: 1511 times
01/14/09
Akialoa, extinct
Viewed: 1808 times
01/14/09
Threatened, Jaguar, Jungle habitats
Viewed: 1595 times
01/14/09
Quagga (Equus Quagga), extinct
Viewed: 1719 times
01/14/09
Japanese Wolf (Canis Lupus Hodophilax), extinct
Viewed: 1796 times
01/14/09

Extinct, Pacific Island Grosbeak
Viewed: 1762 times
01/14/09
Viewed: 1481 times
01/14/09
Viewed: 1440 times
01/14/09
Viewed: 1451 times
01/14/09
Viewed: 1564 times
01/14/09

Viewed: 1491 times
01/14/09
Spiny acritarchs preserved in Doushantuo cherts
Viewed: 1917 times
01/14/09
spiny-acritarchs1
Viewed: 1677 times
01/14/09
DoushantuoBranchingTubes
Viewed: 1634 times
01/14/09
An artist's reconstruction shows a curled-up dinosaur embryo inside an egg. The actual egg is a little more than 2 inches (6 centimeters) in length. Image: Kevin Dupuis, University of Toronto at Mississauga
Viewed: 1891 times
01/14/09

Adult Massospondylus and embryo, Image: Robert Reisz, University of Toronto at Mississauga
Viewed: 2205 times
01/14/09
Cyanobacteria Bloom in Lake Ponchartrain, LA, an oligohaline estuary
Credit: View
Viewed: 1761 times
01/14/09
Warrior anemones reach over from several rows behind the front to attack animals from a neighboring colony. (Rick Grosberg/UC Davis photo)
Viewed: 1730 times
01/14/09
This picture shows how DNA bases are stacked together along the double helix. The atoms of the sugar-phosphate backbone are shown in gray, and the ultraviolet-absorbing portions of DNA -- the bases -- are shown in blue or magenta, depending on which side of the DNA strand they are located. Image courtesy of Bern Kohler, Ohio State University.
Viewed: 2048 times
01/14/09
This graph shows how quickly ultraviolet (UV) energy deposited in the electrons of a nucleoside is converted to heat, which is then absorbed by water surrounding the nucleoside. Here, time is measured in femtoseconds, or quadrillions of a second. The diagram to the upper right of the image depicts a particular nucleoside -- adenosine. This molecule consists of a UV-absorbing base (shown in red) and a simple sugar (shown in gray) that binds it to the RNA backbone. This base is also found in DNA. Credit: Ohio State University
Viewed: 2026 times
01/14/09

Radiocarbon peaks in Icelandic marine sediment samples, indicated by the black line, coincide with three supernova-caused events that Firestone and Wells believe led to the extinction of the mammoth. Credit: Berkeley Lab
Viewed: 1699 times
01/14/09
Mammoths
Credit: USGS
Viewed: 1752 times
01/14/09
Female Leah Using a Walking Stick while Crossing Bipedally through an Elephant Pool at Mbeli Bai.
Credit: PLoS
Viewed: 1845 times
01/14/09
Female Efi Using Trunk as a Stabilizer during Food Processing at Mbeli Bai
The top photo shows the intact trunk shortly before Efi manipulated it. The trunk was then detached by female Efi with both hands, pushed into the ground, and used as a stabilizing stick while dredging aquatic herbs towards her with her other hand. From: PLoS Biol 3(11): e380
Viewed: 1928 times
01/14/09
Female Leah Using a Walking Stick while Crossing Bipedally through an Elephant Pool at Mbeli Bai
Female Leah first looked at the new elephant pool and the branch she later used as the walking stick, and entered the water without the tool (not shown). After re-entering the pool and taking the branch with her right hand, she walked bipedally 8–“10 m into the water, frequently testing water deepness.
From: PLoS Biol 3(11): e380
Viewed: 1935 times
01/14/09

Photo of reconstructed skeleton of Buitreraptor gonzalezorum. The long hindlimbs indicate that the animal was a fast runner. The elongated arms and massive shoulder girdle indicate powerful prey-grasping abilities. Like all other dromaeosaurs, Buitreraptor was armed with an enlarged claw on the second toe of each foot.
© 2005 The Field Museum, Photo by John Weinstein, image# GEO86430_30d
Viewed: 1949 times
01/14/09
The skeleton of Buitreraptor gonzalezorum in the field. A string of vertebrae and the right shoulder (lower left) and femur are showing. The match-stick shows scale.
Photo by Peter Makovicky, Courtesy of The Field Museum
Viewed: 1923 times
01/14/09
The Buitreraptor gonzalezorum quarry. The holotype specimen was extracted in an 800-pound block of sandstone that took 10 days to extract using a rock-saw and chisels. The picture shows Field Museum preparator Jim Holstein (left) and Argentine paleontologist Pablo Gallina at work. Temperatures soared above 100? F on most days. Fieldwork was supported by NASA, The Jurassic Foundation, and Michael and Jacqueline Ferro of Chicago.
Photo by Peter Makovicky, Courtesy of The Field Museum
Viewed: 2013 times
01/14/09
Dinosaur Landscape
Viewed: 1514 times
01/14/09
Skeleton of Microraptor gui, a feathered dinosaur from the early Cretaceous (about 125 million years old) of China has preserved traces of feathers in the wings and legs, suggesting a biplane configuration. The animal was about 30 inches long with a bony tail and weighed about 2 pounds (courtesy: Dr. Xing Xu)
Viewed: 1935 times
01/14/09

A biplane glider Microraptor gui from China compared with the Wright 1903 Flyer. Microraptor invented the biplane 125 million years ago (courtesy: Jeff Martz).
Viewed: 1740 times
01/14/09
Fruit fly Drosophila melanogaster
Credit: UCSD
Viewed: 1619 times
01/14/09
Bonnet macques, India
Credit: Illinois St. University, Mary H. Lee
Viewed: 1676 times
01/14/09
Bumblebee solving a complex color puzzle. Credit: University College London
Viewed: 1638 times
01/14/09
Credit: NASA
Viewed: 1546 times
01/14/09

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