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91. Meanwhile, the larger birds of prey were tucking into things like mice, rats, chicks and rabbits.

92. Another line of research linking alcohol and serotonin involves rats bred for their avid preference for alcohol.

93. Accompanying the astronauts on the flight are a dozen rats, 36 fish embryos and 20 loblolly pine seedlings.

94. But melatonin did. Daily injections of melatonin given at 3.30 each afternoon, entrained the rats to a 24 hour cycle.

95. One of the rats is just sitting in the corner and I wonder if maybe it's smart enough to be depressed.

96. If they are afraid of rats,[http://sentencedict.com/rats.html] an iron cage of rats strapped over the chest or face is used.

97. The rats eventually managed to press the lever very quickly after being placed in the box, in order to receive their reward.

98. Among the plastic rats, fluffy animals and copies of the Sun decorating the desks was at least one Labour red rose.

99. Rats in their thousands fed on the grain in the Government stores while the people went hungry.

100. Allowed free access to their own reward centers, many of the rats became hopeless lever addicts.

101. Rats placed on to a semi-starvation diet live longer than those given food ad libitum.

102. Out in the field, we looked like a bunch of drowned rats.

103. Daily injections of melatonin given at 3.30 each afternoon, entrained the rats to a 24 hour cycle.

104. As the crowd grew more restless, the speaker before Alan showed a film about rats whose longevity had been extended.

105. Giraffes and upstanding bears are more popular than snakes, rats and spiders.

106. Nevertheless, rats can be trained to carry out visual discrimination tasks and will use visual cues to guide their natural behaviour.

107. In this study no difference was observed in the plasma cholesterol concentration between control and diabetic rats.

108. It's believed the protests were against the breeding of rats and mice for experiments.

109. Through that hot and humid night, he was bitten by mosquitoes and nipped by rats.

110. Some genetically different strains of rats, for example, differ in their ability to learn to run through mazes.

111. In some of his experiments the rats were rolling along to get to the food in the goal-box.

112. There was no significant difference in percentage of cells in S phase in the distal colon of rats in both diet groups.

113. Another residents discovered rats had got into a kitchen cupboard and eaten packets of food.

114. The factors that influence the size of the proliferative compartment are less clear, though in rats there are genetic differences.

115. With another wave, the bureaucrats were banished, gone for ever, scurrying like little, fat rats into the alleyways.

116. Tests in mice and rats showed no signs of negative side effects.

117. Animals are often poor models for humans; bones in rats are quite different from human bones.

118. I suspected they were pack rats because they were too smart to get themselves caught in the traps I set for them.

119. About half of the chemicals that were tested caused cancer in rats.

120. Bubonic plague is not directly associated with water, but the rats which carried it arrived by boat at riverside wharves.