Penguin Nesting Dolls - 6 Matryoshka Penguins - All Hollow To Fit Inside Each Other 6 Unique Matryoshka Nesting Dolls. Penguins Range From 4.5'' to 2" in Height. Every Penguin Is Hollow To Keep Your Secret Stuff Inside. Pack Comes With Facts About Pengins, Their Habitat and History. Great Educational Gift For All Ages