noun, plural rookeries.
a breeding place or colony of gregarious birds or animals, as penguins and seals.
a colony of rooks.
a place where rooks congregate to breed.
a crowded tenement house.

1715–25; rook1 + -ery Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rookery (ˈrʊkərɪ)
n , pl -eries
1.  a group of nesting rooks
2.  a clump of trees containing rooks' nests
3.  a.  a breeding ground or communal living area of certain other species of gregarious birds or mammals, esp penguins or seals
 b.  a colony of any such creatures
4.  archaic an overcrowded slum tenement building or area of housing

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rookery   (rk'ə-rē)  Pronunciation Key 
A place where certain birds or animals, such as crows, penguins, and seals, gather to breed.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the end of their third week, having almost given up on living, they find the
Here, two females go nose-to-nose over a disputed bit of territory in a crowded
The only way you could find the center is if you could first locate the edge of
  the rookery.
Significantly, the coast around the lighthouse has become a well-known rookery
  for local elephant seals.
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