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NTRODUCTION
Most laboratory experiments especially in biology involves working with animals and plants such as rats, mice, rabbits and guinea pigs. This is because it is ethically impossible to use human or human specimens in doing this experiments but it is possible to obtain similar results using laboratory animals.
These animals are easy to maintain in a laboratory environment, reproduce faster and have short life expectancy which enables the effect of a lifetime to be observed in relatively short life time.
Laboratory animals should be handled with care and any experiments dealing with them should be under control making sure that no stipulated regulation and legislation stipulated concerning them is infringed.
Laboratory animals include generally any small animal that can be easily handle in the laboratory environment e.g.rats, mice, rabbits , guinea pigs , hamsters , amphibians , reptiles, and insects like locust , mosquitoes ,and even some microorganisms like protozoa and bacteria .