Agriculture
Keeping Bugs Away from Food
Got Milk? How?
Where Have All the Bees Gone?
Amphibians
Salamanders
Salamanders and Newts
Frogs and Toads
Animals
Mating Slows Down Prairie Dogs
Saving Africa's Wild Dogs
Assembling the Tree of Life
Behavior
Monkeys in the Mirror
Internet Generation
Memory by Hypnosis
Birds
Vultures
Nightingales
Turkeys
Chemistry and Materials
Lighting goes digital
Earth-Friendly Fabrics
Picture the Smell
Computers
Look into My Eyes
Troubles with Hubble
Music of the Future
Dinosaurs and Fossils
Teeny Skull Reveals Ancient Ancestor
Supersight for a Dino King
The man who rocked biology to its core
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Undersea Vent System Active for Ages
A Volcano Wakes Up
Earth from the inside out
Environment
Groundwater and the Water Cycle
Ready, unplug, drive
Watching for Wildfires in Yellowstone
Finding the Past
Traces of Ancient Campfires
Oldest Writing in the New World
Unearthing Ancient Astronomy
Fish
Basking Sharks
Puffer Fish
Trout
Food and Nutrition
Sponges' secret weapon
Eat Out, Eat Smart
The Color of Health
GSAT English Rules
Who vs. Whom
Whoever vs. Whomever
Problems with Prepositions
GSAT Exam Preparation Jamaica
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
Access denied - Disabled boy aces GSAT
GSAT Scholarship
GSAT Mathematics
42,000 students will sit for the GSAT Exam in two weeks
10 Common Mistakes When Preparing for the GSAT Math Test
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Human Body
Walking to Exercise the Brain
Surviving Olympic Heat
Dreaming makes perfect
Invertebrates
Crustaceans
Nautiluses
Sea Urchin
Mammals
Bloodhounds
Cornish Rex
Dogs
Parents
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
Physics
Extra Strings for New Sounds
Echoes of a Stretched Egg
The Pressure of Scuba Diving
Plants
Fungus Hunt
Getting the dirt on carbon
Pumping Up Poison Ivy
Reptiles
Pythons
Asp
Turtles
Space and Astronomy
Cousin Earth
Pluto's New Moons
Galaxies Divide Sharply Along Color Lines
Technology and Engineering
A Clean Getaway
A Light Delay
Crime Lab
The Parts of Speech
Countable and Uncountable Nouns
Adjectives and Adverbs
Pronouns
Transportation
Robots on a Rocky Road
Are Propellers Fin-ished?
Charged cars that would charge
Weather
Earth's Poles in Peril
A Dire Shortage of Water
A Change in Climate
Add your Article

Nurse Sharks

Nurse sharks are cosmopolitan carpet sharks belonging to the family Ginglymostomatidae. Common in shallow, tropical and subtropical waters of the western Atlantic and eastern Pacific, the family comprises three genera each with one species. They are benthic sharks, characterised as being sluggish and docile. Nurse sharks typically attack humans only if directly threatened. Weights and Measures: The largest species, called simply the nurse shark (Ginglymostoma cirratum), may reach a length of 4.3 metres; the tawny nurse shark (Nebrius ferrugineus) is somewhat smaller at 3.2 metres, and the short-tailed nurse shark (Pseudoginglymostoma brevicaudatum) is by far the smallest at just 75 centimetres in length. The first of the three species may reach a weight of 110 kilograms. Muscular Pecs: Yellowish to dark brown in colour, nurse sharks have muscular pectoral fins, two spineless dorsal fins (the second of which is smaller) in line with the pelvic and anal fins, and a tail exceeding one quarter the shark's body length. Fleshy Barbels: The mouths of nurse sharks are most distinctive; it is far ahead of the eyes and before the snout (sub-terminal), an indication of the bottom-dwelling (benthic) nature of these sharks. Also present on the lower jaw are two fleshy barbels, chemosensory organs which help the nurse sharks to find prey hidden in the sediments. Behind each eye is a very small circular opening called a spiracle, part of the shark's respiratory system. The serrated teeth are fan-shaped and independent; like other sharks, the teeth are continually replaced throughout the animal's life. Night Nurse: Nurse sharks are nocturnal animals, spending the day in large inactive groups of up to 40 individuals. Hidden under submerged ledges or in crevices within the reef, the nurse sharks seem to prefer specific haunts and will return to them every day. By night, the sharks are largely solitary; they spend most of their time rifling through the bottom sediments in search of food. Their diet consists primarily of crustaceans, molluscs, tunicates, and other fish, particularly stingrays. On the Menu: Nurse sharks are thought to take advantage of dormant fish which would otherwise be too fast for the sharks to catch; although their small mouths limit the size of prey items, the sharks have large throat cavities which are used as a sort of bellows valve. In this way nurse sharks are able to suck in their prey like a vacuum. Nurse sharks are also known to graze algae and coral. Birds and Bees: The mating season runs from late June to the end of July. Nurse sharks are ovoviviparous, meaning the eggs develop and hatch within the body of the female, where the hatchlings develop further until live birth occurs. The gestation period is six months, with a typical brood of 30-40 pups. The mating cycle is biennial, as it takes 18 months for the female's ovaries to produce another batch of eggs. The young nurse sharks are born fully developed at about 30 centimetres long in Ginglymostoma cirratum. They possess a spotted coloration which fades with age.

Nurse Sharks
Nurse Sharks








Designed and Powered by HBJamaica.com™