Agriculture
Chicken Eggs as Drug Factories
Microbes at the Gas Pump
Protecting Cows—and People—from a Deadly Disease
Amphibians
Bullfrogs
Toads
Newts
Animals
Pothole Repair, Insect-style
Assembling the Tree of Life
Putting a Mouse on Pause
Behavior
Contemplating thought
Fear Matters
Video Game Violence
Birds
Quails
Ibises
Lovebirds
Chemistry and Materials
Heaviest named element is official
Hair Detectives
The Buzz about Caffeine
Computers
Nonstop Robot
The hungry blob at the edge of the universe
Galaxies on the go
Dinosaurs and Fossils
Dino Flesh from Fossil Bone
Hall of Dinos
Feathered Fossils
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
Giving Sharks Safe Homes
Science loses out when ice caps melt
Vitamin D-licious Mushrooms
Environment
What is groundwater
Will Climate Change Depose Monarchs?
Shrinking Fish
Finding the Past
Settling the Americas
Traces of Ancient Campfires
Stone Age Sole Survivors
Fish
Electric Ray
A Grim Future for Some Killer Whales
Carp
Food and Nutrition
Food for Life
The Color of Health
Packing Fat
GSAT English Rules
Who vs. That vs. Which
Whoever vs. Whomever
Who vs. Whom
GSAT Exam Preparation Jamaica
10 Common Mistakes When Preparing for the GSAT Math Test
42,000 students will sit for the GSAT Exam in two weeks
Results of GSAT are in schools this week
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
Results of GSAT are in schools this week
GSAT Scholarship
GSAT Mathematics
Deep-space dancers
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Monkeys Count
Human Body
A Better Flu Shot
Heavy Sleep
Kids now getting 'adult' disease
Invertebrates
Flatworms
Hermit Crabs
Tapeworms
Mammals
Manatees
Miscellaneous Mammals
Deers
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Children and Media
How children learn
Physics
The Pressure of Scuba Diving
Extra Strings for New Sounds
Thinner Air, Less Splatter
Plants
Stalking Plants by Scent
Tracking the Sun Improves Plant Pollen
Fast-flying fungal spores
Reptiles
Cobras
Geckos
Snakes
Space and Astronomy
Super Star Cluster in the Neighborhood
Wrong-way planets do gymnastics
Sounds of Titan
Technology and Engineering
Searching for Alien Life
Morphing a Wing to Save Fuel
Switchable Lenses Improve Vision
The Parts of Speech
Problems with Prepositions
What is a Noun
What is a Preposition?
Transportation
Robots on the Road, Again
How to Fly Like a Bat
Morphing a Wing to Save Fuel
Weather
A Dire Shortage of Water
Where rivers run uphill
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™