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Frogs and Toads
A Seabird's Endless Summer
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A Tongue and a Half
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Chemistry and Materials
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Undercover Detectives
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Battling Mastodons
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Sounds and Silence
Finding the Past
Childhood's Long History
Stone Tablet May Solve Maya Mystery
Digging Up Stone Age Art
Whale Sharks
A Jellyfish's Blurry View
Food and Nutrition
The Essence of Celery
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GSAT English Rules
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Finding Subjects and Verbs
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Human Body
Taking the sting out of scorpion venom
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Black Widow spiders
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Children and Media
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Electric Backpack
Strange Universe: The Stuff of Darkness
The Particle Zoo
Assembling the Tree of Life
Making the most of a meal
Flower family knows its roots
Copperhead Snakes
Gila Monsters
Snapping Turtles
Space and Astronomy
Zooming In on the Wild Sun
Evidence of a Wet Mars
Black Holes That Burp
Technology and Engineering
Squeezing Oil from Old Wells
Toy Challenge
Slip Sliming Away
The Parts of Speech
What is a Verb?
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How to Fly Like a Bat
Revving Up Green Machines
Where rivers run uphill
The Best Defense Is a Good Snow Fence
Catching Some Rays
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Listen outside in any season, at almost any time of day, and you'll hear them: songbirds. Although most birds make some kind of noise, songbirds put on a particularly brilliant show, using their voices to produce pleasing whistles, chirps, and melodies to challenge one another, attract a mate, or communicate with other members of their species. Bird songs between species are so unique that birdwatchers can identify species just by the song they're singing. A songbird is a bird belonging to the suborder Oscines of Passeriformes (ca. 4000 species), in which the vocal organ is developed in such a way as to produce various sound notes, commonly known as bird song. Songbirds evolved about 50 million years ago in the western part of Gondwana that later became Australia, New Zealand and Antarctica and later spread around the world. This 'bird song' is essentially territorial in that it communicates the identity and whereabouts of an individual to other birds and also signals sexual intentions. It is not to be confused with bird calls which are used for alarms and contact, and are especially important in birds that feed or migrate in flocks. Other birds have songs to attract mates or hold territory, but these are usually simple and repetitive, lacking the variety of many passerine songs. The monotonous repetition of the Common Cuckoo or Little Crake can be contrasted with the variety of a Nightingale or Marsh Warbler. Although many songbirds have songs which are pleasant to the human ear, this is not invariably the case. Many members of the crow family make croaks or screeches which sound harsh to humans


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