U
This collection of terms and their definitions should help as you try to understand the vast language that has developed for the study of animals. Terms in this category begin with the letter 'U'.
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Please refer to the Glossary Citations page for details about sources used for glossary entries.
Glossary index: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
Please refer to the Glossary Citations page for details about sources used for glossary entries.
Uropygial Gland
"The source of the oil that a preening bird rubs on its feathers to maintain them in good condition; located on the lower back near the rump." (Source: Sibley)
"The source of the oil that a preening bird rubs on its feathers to maintain them in good condition; located on the lower back near the rump." (Source: Sibley)
Upland
"Pertaining to areas away from coastlines and the floodplains of rivers, streams, and other bodies of water." (Source: Sibley)
"Pertaining to areas away from coastlines and the floodplains of rivers, streams, and other bodies of water." (Source: Sibley)
Upwelling
"Oceanic areas where deep waters rich in nutrients rise to the surface because of the shape of the ocean bottom, the presence of continental land masses, or contact between water currents." (Source: Sibley)
"Oceanic areas where deep waters rich in nutrients rise to the surface because of the shape of the ocean bottom, the presence of continental land masses, or contact between water currents." (Source: Sibley)
Urohydrosis
"The habit of releasing feces onto the scaly portions of the leg as a cooling mechanism, using evaporative cooling of the fluids. Found in storks and New World vultures." (Source: Sibley)
"The habit of releasing feces onto the scaly portions of the leg as a cooling mechanism, using evaporative cooling of the fluids. Found in storks and New World vultures." (Source: Sibley)