Unusual and Rare Hybrid Animals
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10. This bird is called a mule. No, not a mule that carries your rucksack but a bird that is a cross between the European Goldfinch and the canary. This combination created one of the most beautiful bird songs ever heard. However, these animals are called ‘mules’ as actual mules can be commonly crossbred but are infertile and unable to procreate as is the namesake bird.
