Agriculture
Cleaning Up Fish Farms
Where Have All the Bees Gone?
Keeping Bugs Away from Food
Amphibians
Bullfrogs
Newts
Salamanders and Newts
Animals
Crocodile Hearts
Dolphin Sponge Moms
Jay Watch
Behavior
Reading Body Language
Swedish Rhapsody
Puberty gone wild
Birds
Pelicans
Vultures
Cardinals
Chemistry and Materials
Atom Hauler
Batteries built by Viruses
Nanomagnets Corral Oil
Computers
Games with a Purpose
Supersonic Splash
Middle school science adventures
Dinosaurs and Fossils
Did Dinosaurs Do Handstands?
A Dino King's Ancestor
Mini T. rex
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Watering the Air
Detecting an Eerie Sea Glow
Shrinking Glaciers
Environment
Where rivers run uphill
Catching Some Rays
Pollution Detective
Finding the Past
A Long Haul
Writing on eggshells
A Plankhouse Past
Fish
Bass
Manta Rays
Angler Fish
Food and Nutrition
Making good, brown fat
Recipe for Health
Moving Good Fats from Fish to Mice
GSAT English Rules
Whoever vs. Whomever
Capitalization Rules
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
GSAT Practice Papers | GSAT Mathematics | Maths
Tarrant High overcoming the odds
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
GSAT Exams Jamaica Scholarships
2014 GSAT Results for Jamaican Kids
GSAT Scholarship
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
Math of the World
Deep-space dancers
42,000 students will sit for the GSAT Exam in two weeks
Human Body
Surviving Olympic Heat
Opening a Channel for Tasting Salt
Germ Zapper
Invertebrates
Millipedes
Bees
Cockroaches
Mammals
Labradors
Gerbils
Boxers
Parents
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
What Not to Say to Emerging Readers
Physics
Strange Universe: The Stuff of Darkness
Extra Strings for New Sounds
Einstein's Skateboard
Plants
Fungus Hunt
Plants Travel Wind Highways
When Fungi and Algae Marry
Reptiles
Copperhead Snakes
Garter Snakes
Anacondas
Space and Astronomy
Sun Flips Out to Flip-Flop
Evidence of a Wet Mars
Return to Space
Technology and Engineering
Morphing a Wing to Save Fuel
Smart Windows
Model Plane Flies the Atlantic
The Parts of Speech
Pronouns
Adjectives and Adverbs
Countable and Uncountable Nouns
Transportation
Seen on the Science Fair Scene
Ready, unplug, drive
Reach for the Sky
Weather
Weekend Weather Really Is Different
Recipe for a Hurricane
Either Martians or Mars has gas
Add your Article

Island Extinctions

People arrived in Australia about 50,000 years ago. Soon after, many of the island's large mammals disappeared, new evidence suggests. Among the animals that went extinct were several species of kangaroos and wombats and some other creatures found nowhere else. Known as marsupials, these animals had pouches but filled ecological niches populated elsewhere by lions, hyenas, hippos, tapirs, and other large animals. This illuminating new look into the past comes from a group of caves in southeastern Australia. Fossils fill the caves, which lie 300 kilometers (186 miles) southeast of Adelaide. Researchers led by a paleontologist at the Western Australian Museum in Perth collected, identified, and dated fossils that covered some 500,000 years of history. The bones that they found belonged to 62 species of mammals that didn't fly. Most of these creatures fell into the caves through sinkholes in the ground. Owls brought in others. Previously, scientists had used icicle-like rock formations, called stalactites, to piece together a history of climate change in the area. When the weather was wet, water dripped down the stalactites, making them grow. During dry times, stalactite growth stopped. Over the past 500,000 years, the Perth scientists found, the number and types of mammals in the caves decreased only during long dry spells. The animals came back when the rains returned. Between 50,000 and 45,000 years ago, however, many of Australia's creatures that were cat-sized or larger disappeared, even though there was no major climate shift. The next ice age wouldn't begin for another 25,000 years. "The climate was stable then, and mammals really shouldn't have been going extinct," says Richard G. Roberts, a geochemist at the University of Wollongong in Australia. "The only thing that's new during that period," he adds, "is people." Scientists aren't yet sure how people might have caused the wave of extinction among large animals in Australia. People often burned much of the landscape, and some experts argue that animals died as fire destroyed their habitats. It's also possible that large species dwindled gradually as people hunted and ate them faster than they could reproduce. Whatever the explanation, the data are clear. People had a more profound effect on the lives (and deaths) of Australian animals than climate change did.E. Sohn

Island Extinctions
Island Extinctions








Designed and Powered by HBJamaica.com™