4 of 20: A White tiger cub growls in its enclosure at the Buenos Aires Zoo in Argentina, Thursday, March 21, 2013. The Argentine zoo is showing off four new white tiger cubs that Cleo, a Bengal white tiger, gave birth to on Jan. 14. Zoo officials say the blue-eyed cubs with coats of black stripes on white bring the number of White Bengal tigers at the zoo to nine. (AP Photo/Natacha Pisarenko) (AP Photo/ Natacha Pisarenko)

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