Agriculture
Chicken Eggs as Drug Factories
Treating peanut allergy bit by bit
Middle school science adventures
Amphibians
Newts
Frogs and Toads
Tree Frogs
Animals
Color-Changing Bugs
Sea Giants and Island Pygmies
Big Squid
Behavior
A brain-boosting video game
Memory by Hypnosis
Giving Sharks Safe Homes
Birds
Kingfishers
Lovebirds
Emus
Chemistry and Materials
Nanomagnets Corral Oil
The newest superheavy in town
The solar system's biggest junkyard
Computers
Getting in Touch with Touch
Hubble trouble doubled
Look into My Eyes
Dinosaurs and Fossils
Middle school science adventures
Supersight for a Dino King
Teeny Skull Reveals Ancient Ancestor
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Salty, Old and, Perhaps, a Sign of Early Life
Life trapped under a glacier
A Global Warming Flap
Environment
The Best Defense Is a Good Snow Fence
Improving the Camel
A 'Book' on Every Living Thing
Finding the Past
A Long Haul
Little People Cause Big Surprise
Digging Up Stone Age Art
Fish
Bull Sharks
Barracudas
A Grim Future for Some Killer Whales
Food and Nutrition
Making good, brown fat
Recipe for Health
Building a Food Pyramid
GSAT English Rules
Problems with Prepositions
Order of Adjectives
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
2014 GSAT Results for Jamaican Kids
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT stars reap scholarship glory
GSAT Mathematics
GSAT Practice Papers | GSAT Mathematics | Maths
10 Common Mistakes When Preparing for the GSAT Math Test
It's a Math World for Animals
Human Body
Speedy Gene Gives Runners a Boost
Surviving Olympic Heat
A Better Flu Shot
Invertebrates
Worms
Scorpions
Termites
Mammals
Rats
Polar Bear
African Leopards
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
What Not to Say to Emerging Readers
Physics
Black Hole Journey
Speedy stars
The Mirror Universe of Antimatter
Plants
Flower family knows its roots
Underwater Jungles
The algae invasion
Reptiles
Rattlesnakes
Geckos
Reptiles
Space and Astronomy
A Whole Lot of Nothing
Melting Snow on Mars
Roving the Red Planet
Technology and Engineering
A Satellite of Your Own
Machine Copy
Smart Windows
The Parts of Speech
What is a Preposition?
What is a Noun
Adjectives and Adverbs
Transportation
Seen on the Science Fair Scene
How to Fly Like a Bat
Ready, unplug, drive
Weather
Polar Ice Feels the Heat
Arctic Melt
Weekend Weather Really Is Different
Add your Article

Seal

The true seals or earless seals are one of the three main groups of mammals within the seal suborder, Pinnipedia. All true seals are members of the family Phocidae. They are sometimes called crawling seals, to distinguish them from the fur seals and sea lions of family Otariidae. Phocids have no ears: Phocids are the more highly specialized for aquatic life of the two groups and, unlike otariids, lack external ears and cannot bring their hind flippers under their body to walk on them. Galumphing on land: They are more streamlined than fur seals and sea lions, and can therefore swim more effectively over long distances than those can. However, because they cannot turn their hind flippers downward, they are very clumsy on land, having to wiggle with their front flippers and abdominal muscles; this method of locomotion is called galumphing. Eared seals live more on the land: The eared seals (or walkinvg seals), family Otariidae, are the fur seals and the sea lions. These are barrel shaped marine mammals, adapted to a semi-aquatic lifestyle. They feed and travel in the water but breed and largely rest on land (or, in some cases, on ice). They are slightly less adapted to the aquatic lifestyle than are the true seals. True seals don't bark: Additionally, true seals do not communicate by "barking" like the fur seals and sea lions of family Otariidae. They communicate by slapping the water and grunting. Efficient, economical movement: While otariids are built for speed and maneuverability in the water, phocids are built for efficient, economical movement. This allows most phocids to make long foraging trips to exploit prey resources that are far from land, whereas otariids are tied to rich upwelling zones close to their breeding sites. Important fat reserves: The phocid reproductive cycle is characterized by temporal and spatial separation between feeding and maternal investment; in other words, a pregnant female spends a long period of time foraging at sea, building up her fat reserves, and then returns to the breeding site and uses her stored energy reserves to provide milk for her pup. It should be noted that the common seal (harbor seal in the U.S.), Phoca vitulina, does not separate foraging and maternal investment; instead, it displays a reptroductive strategy similar to those of otariids, in which the mother makes short foraging trips between nursing bouts. Lactate or eat: Because a phocid mother's feeding grounds are often hundreds of kilometers from the breeding site, this means that she must fast while she is lactating. This combination of fasting with lactation is one of the most unusual and extraordinary behaviors displayed by the Phocidae, because it requires the mother seal to provide large amounts of energy to her pup at a time when she herself is taking in no food (and often, no water) to replenish her stores. Thick, rich-fat milk: Because they must continue to burn fat reserves to supply their own metabolic needs while they are feeding their pups, phocid seals have developed an extremely thick, fat-rich milk that allows them to provide their pups with a large amount of energy in as small a period of time as possible. This allows the mother seal to maximize the efficiency of her energy transfer to the pup and then quickly return to sea to replenish her reserves. The length of lactation in phocids ranges from 28 days in the Northern Elephant Seal to just 35 days in the Hooded Seal. The nursing period is ended by the mother, who departs to sea and leaves her pup at the breeding site. Pups will continue to nurse if given the opportunity, and "milk stealers" that suckle from unrelated, sleeping females are not uncommon; this often results in the death of the pup whose mother the milk was stolen from, as any single female can only produce enough milk to provision one pup. Milk energy: Because the pup receives the milk energy from its mother so quickly, its development is typically not complete enough for it to begin foraging on its own as soon as the nursing period is complete. Seals, like all marine mammals, need time to develop the oxygen stores, swimming muscles and neural pathways necessary for effective diving and foraging. Because of this, most phocids undergo a postweaning fast, in which they remain on or near the breeding site and live off of the fat stores they acquired from their mothers until they are ready to begin foraging on their own. These pups typically eat no food and drink no water during the fast, although some polar species have been observed to eat snow. The postweaning fast ranges from 2 weeks in the Hooded Seal to 9-12 weeks in the Northern Elephant Seal. The physiological and behavioral adaptations that allow phocid pups to endure these remarkable fasts, which are among the longest for any mammal, remain an area of active study and research.

Seal
Seal








Designed and Powered by HBJamaica.com™