Agriculture
Got Milk? How?
Middle school science adventures
Growing Healthier Tomato Plants
Amphibians
Bullfrogs
Tree Frogs
Frogs and Toads
Animals
Sea Lilies on the Run
Insect Stowaways
A Meal Plan for Birds
Behavior
Girls are cool for school
Flower family knows its roots
A Light Delay
Birds
Kiwis
Songbirds
Lovebirds
Chemistry and Materials
Spinning Clay into Cotton
Bang, Sparkle, Burst, and Boom
Mother-of-Pearl on Ice
Computers
It's a Small E-mail World After All
New eyes to scan the skies
Nonstop Robot
Dinosaurs and Fossils
Ancient Critter Caught Shedding Its Skin
Dinosaurs Grow Up
Dino Flesh from Fossil Bone
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
In Antarctica watch the heat (and your step)
Island of Hope
A Grim Future for Some Killer Whales
Environment
Groundwater and the Water Cycle
Improving the Camel
A Change in Time
Finding the Past
A Volcano's Deadly Ash
Little People Cause Big Surprise
Of Lice and Old Clothes
Fish
Electric Catfish
Flashlight Fishes
Puffer Fish
Food and Nutrition
A Taste for Cheese
Building a Food Pyramid
Yummy bugs
GSAT English Rules
Order of Adjectives
Subject and Verb Agreement
Whoever vs. Whomever
GSAT Exam Preparation Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
The Annual GSAT Scholarships
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
GSAT Mathematics
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Math and our number sense: PassGSAT.com
Human Body
Don't Eat That Sandwich!
Dreaming makes perfect
A Better Flu Shot
Invertebrates
Mussels
Walking Sticks
Mosquitos
Mammals
Mongooses
Koalas
Mule
Parents
Children and Media
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
Physics
Road Bumps
Thinner Air, Less Splatter
IceCube Science
Plants
A Change in Leaf Color
Fungus Hunt
Springing forward
Reptiles
Rattlesnakes
Lizards
Alligators
Space and Astronomy
An Earthlike Planet
Holes in Martian moon mystery
Supernovas Shed Light on Dark Energy
Technology and Engineering
A Satellite of Your Own
Beyond Bar Codes
Drawing Energy out of Wastewater
The Parts of Speech
Problems with Prepositions
Pronouns
Countable and Uncountable Nouns
Transportation
Robots on a Rocky Road
Troubles with Hubble
Robots on the Road, Again
Weather
Earth's Poles in Peril
Either Martians or Mars has gas
A Dire Shortage of Water
Add your Article

Mammals in the Shadow of Dinosaurs

Dinosaurs spent 170 million years on Earth before they suddenly died out about 65 million years ago. After dinosaurs disappeared, mammals took over. It turns out that small mammals lived during the reign of dinosaurs, too. And over the last few years, a flurry of new discoveries has revealed what these creatures were like. They were not the pathetic, little creatures that scientists had previously imagined. In fact, these mammals were well-adapted to their habitats, and they survived alongside dinosaurs quite well. Last year, for example, researchers looked at the remains of a chipmunk-like creature that lived 150 million years ago. Fossils included a lower jaw, skull fragments, and 40 percent of a skeleton. Based on their size, shape, and arrangement, the animal's foot and limb bones indicate that it did a lot of digging. It's the first animal of that era shown to have this type of behavior. Also last year, paleontologists analyzed two skeletons of a type of predator that belonged to the genus Repenomamus. These mammals lived in China about 130 million years ago. One species of Repenomamus is the largest mammal yet discovered from the dinosaur age. It measured 1 meter (3.3 feet long) and weighed up to 14 kilograms (31 pounds). It looked like a badger. Another species of Repenomamus was about the size of an opossum. One specimen was found with the remains of a baby dinosaur in its stomach (see "Dino Takeout for Mammals"). "These are spectacular discoveries," says Jason A. Lillegraven, a paleontologist at the University of Wyoming in Laramie. "They show a degree of diversification [of early mammals] that we hadn't recognized before." The most recent addition to the growing list of ancient mammals is called Castorocauda lutrasimilis, which means "beaver-tailed creature that looks like an otter." It lived about 164 million years ago in northeastern China. At 50 centimeters (19.7 inches) long, Castorocauda was about the size of a platypus. It probably weighed some 800 grams (1.8 pounds). That's more than 10 times heavier than other mammals living at that time. Castorocauda's remains include the oldest fossilized fur yet found. Its body was covered by a thick layer of fur underneath an outer coat of long, stiff guard hairs. Like modern beavers, leathery scales and guard hairs covered the creature's tail, which probably helped it swimThe animal's back teeth were shaped like the teeth of modern seals and were useful for both biting and grinding food. Like seals, it probably ate fish and invertebrates that lived in the water. Until recently, most evidence that scientists had of these unique mammals came from fossilized teeth. While plentiful and well-preserved, teeth can reveal only so much. Future finds should help scientists piece together the history of mammalian evolution, both during the time of dinosaurs and beyond.E. Sohn

Mammals in the Shadow of Dinosaurs
Mammals in the Shadow of Dinosaurs








Designed and Powered by HBJamaica.com™