megafauna

[meg-uh-faw-nuh]
noun Ecology.
land animals of a given area that can be seen with the unaided eye.

Origin:
mega- + fauna

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
megafauna (ˈmɛɡəˌfɔːnə)
 
n
the component of the fauna of a region or period that comprises the larger terrestrial animals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
megafauna   (měg'ə-fô'nə)  Pronunciation Key 
Large or relatively large animals of a particular place or time period. Saber-toothed tigers and mastodons belong to the extinct megafauna of the Oligocene and Pleistocene Epochs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

megafauna

in soil science, animals such as earthworms and small vertebrates (e.g., moles, mice, hares, rabbits, gophers, snakes, and lizards). The food habits of soil megafauna vary; earthworms ingest both soil and organic matter, but most of the vertebrates feed on plant material, invertebrates, and other small vertebrate animals. Megafauna are the principal agents of soil turnover and distribution; this movement loosens soil structure, improves aeration and drainage, and distributes soil microorganisms.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Others argue that the discovery of megafauna such as whales prompted stories of
  dragons.
The place was full of charismatic megafauna, as biologists say in moments of
  attempted clarity.
The impact of these changes on megafauna such as great cats has been profound.
Immediately recognizable, these particular species epitomize charismatic
  megafauna.
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