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For Fullsize Image | | File: | 00465418
| | Common Name: | rat with extra legs | | Scientific Name: | rattus norvegicus polycrural |
Details: Sometimes the absorption of a twin in utero results in various appendages of the now parasitic twin to develop extraneously to the intact zygote.
This particular example has two extra legs.
Not a born deformity, made using modern taxidermy techniques. 
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