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In page Microchip implant (animal):

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Since their first use in the mid-1980s, microchips have allowed innovative investigations into numerous biological traits of animals.[1] The tiny, coded markers implanted into individual animals allow assessment of growth rates, movement patterns, and survival patterns for many species in a manner more reliable than traditional approaches of externally marking animals for identification.[1] Microchips have also been used to confirm the identity of zoo animals, pets, and protected species that have been illegally removed from the wild.[1]