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Seeds of the Future
Earth-Friendly Fabrics
Poison Dart Frogs
Tree Frogs
Bee Heat Cooks Invaders
Sleepless at Sea
Eyes on the Depths
Why Cats Nap and Whales Snooze
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Chemistry and Materials
Graphene's superstrength
Fog Buster
Sugary Survival Skill
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The Book of Life
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Mammals in the Shadow of Dinosaurs
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Ice Age Melting and Rising Seas
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Acid Snails
The Down Side of Keeping Clean
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Finding the Past
Stone Age Sole Survivors
Untangling Human Origins
Preserving Ancient Warrior Paint
White Tip Sharks
Food and Nutrition
A Pepper Part that Burns Fat
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Moving Good Fats from Fish to Mice
GSAT English Rules
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Order of Adjectives
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Losing with Heads or Tails
Play for Science
How a Venus Flytrap Snaps Shut
Human Body
Attacking Asthma
Taste Messenger
Walking to Exercise the Brain
Giant Clam
Miscellaneous Mammals
Basset Hounds
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Children and Media
Black Hole Journey
Spin, Splat, and Scramble
Echoes of a Stretched Egg
Bright Blooms That Glow
Assembling the Tree of Life
Flower family knows its roots
Space and Astronomy
A Moon's Icy Spray
Wrong-way planets do gymnastics
A Family in Space
Technology and Engineering
Sugar Power for Cell Phones
Are Propellers Fin-ished?
Slip Sliming Away
The Parts of Speech
Countable and Uncountable Nouns
Problems with Prepositions
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Flying the Hyper Skies
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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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