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Flush-Free Fertilizer
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Salamanders
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Color-Changing Bugs
Sea Lilies on the Run
Red Apes in Danger
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The Electric Brain
The Other Side of the Zoo Fence
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Chemistry and Materials
The memory of a material
Mother-of-Pearl on Ice
Screaming for Ice Cream
Computers
The Book of Life
Small but WISE
Electronic Paper Turns a Page
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Meet your mysterious relative
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Earth
Less Mixing Can Affect Lake's Ecosystem
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Bald Eagles Forever
Giant snakes invading North America
The Wolf and the Cow
Finding the Past
Digging Up Stone Age Art
The Puzzle of Ancient Mariners
Of Lice and Old Clothes
Fish
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Hammerhead Sharks
Eels
Food and Nutrition
Symbols from the Stone Age
Moving Good Fats from Fish to Mice
A Pepper Part that Burns Fat
GSAT English Rules
Who vs. That vs. Which
Order of Adjectives
Problems with Prepositions
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How to Slice a Cake Fairly
Deep-space dancers
How a Venus Flytrap Snaps Shut
Human Body
Taste Messenger
Tapeworms and Drug Delivery
A Better Flu Shot
Invertebrates
Clams
Arachnids
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Mammals
Siamese Cats
Badgers
Bumblebee Bats
Parents
Children and Media
What Not to Say to Emerging Readers
Raise a Lifelong Reader by Reading Aloud
Physics
Echoes of a Stretched Egg
Extra Strings for New Sounds
The Mirror Universe of Antimatter
Plants
Getting the dirt on carbon
Sweet, Sticky Science
Making the most of a meal
Reptiles
Crocodiles
Iguanas
Geckos
Space and Astronomy
Black Holes That Burp
Older Stars, New Age for the Universe
Solving a Sedna Mystery
Technology and Engineering
Crime Lab
Reach for the Sky
Slip Sliming Away
The Parts of Speech
What is a Preposition?
Problems with Prepositions
Adjectives and Adverbs
Transportation
Reach for the Sky
Middle school science adventures
Robots on the Road, Again
Weather
Where rivers run uphill
The Best Defense Is a Good Snow Fence
Earth's Poles in Peril
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Fleas

Flea is the common name for any of the small wingless insects of the order Siphonaptera. Fleas are external parasites, living off the blood of mammals and birds. Itch causing critters: In most cases, fleas are just a nuisance to their hosts, but some people and some animals suffer allergic reactions to flea saliva resulting in rashes. Flea bites generally result in the formation of a slightly raised, swollen, itching spot with a single puncture point at the center. Fleas can also lead to hair loss as a result of frequent scratching and biting by the animal, and can cause anemia in extreme cases. Spreaders... of disease: However, fleas can also act as a vector for disease. One possible example of this was the bubonic plague, which may have been transmitted between rodents and humans. Murine typhus (endemic typhus) fever, and in some cases tapeworms can also be transmitted by fleas. Fleas pass through a complete life cycle consisting of egg, larva, pupa and adult. Completion of the life cycle from egg to adult varies from two weeks to eight months depending on the temperature, humidity, food, and species. Normally after a blood meal, the female flea lays about 15 to 20 eggs per day up to 600 in its lifetime usually on the host (dogs, cats, rats, rabbits, mice, squirrels, chipmunks, raccoons, opossums, foxes, chickens, humans, etc.). Eggs loosely laid in the hair coat drop out almost anywhere, especially where the host rests, sleeps or nests (rugs, carpets, upholstered furniture, cat or dog boxes, kennels, sand boxes, etc.). Eggs hatch between two days to two weeks into larvae found indoors in and along floor cracks, crevices, along baseboards, under rug edges and in furniture or beds. Outdoor development occurs in sandy gravel soils (moist sand boxes, dirt crawlspace under the house, under shrubs, etc.) where the host may rest or sleep. Sand and gravel are very suitable for larval development which is the reason fleas are erroneously called "sand fleas." Larvae are blind, avoid light, pass through three larval instars and take a week to several months to develop. Their food consists of digested blood from adult flea feces, dead skin, hair, feathers, and other organic debris; larvae do not suck blood. Pupae mature to adulthood within a silken cocoon woven by the larva to which pet hair, carpet fiber, dust, grass cuttings, and other debris adheres. In about five to fourteen days, adult fleas emerge or may remain resting in the cocoon until the detection of vibration (pet and people movement), pressure (host animal lying down on them), heat, noise, or carbon dioxide (meaning a potential blood source is near). Most fleas overwinter in the larval or pupal stage with survival and growth best during warm, moist winters and spring. "Flea season" is traditionally at the end of summer and in the early fall, but in warmer areas can last year round.

Fleas
Fleas








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