| 11. | Those two romp together endlessly and except for the difference in size you almost could imagine them littermates.
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| 12. | In more than 90 percent of litters with more than one the littermates have more than one father.
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| 13. | Ferrets play rough with their thick-skinned littermates, she said, and are used to biting them.
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| 14. | Puppies are highly social animals and spend most of their waking hours interacting with either their mother or littermates.
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| 15. | After a while his littermates, Socks and Ruby, come to him for help because their housefolk betrayed them.
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| 16. | Placed in a home with a controlled diet and exercise, the neuters showed no differences in weight from unneutered littermates.
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| 17. | Upon dissection, the brains of vaccinated mice contained no or very small plaques while their unvaccinated littermates had extensive plaques.
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| 18. | Their coordination and strength improve, they spar with their littermates, and begin to explore the world outside the nest.
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| 19. | Tadpole sacrificed his life in order to save his littermates . The place where they were trapped flooded and Tadpole drowned.
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| 20. | By mating the unusual mouse with littermates carrying a recessive gene for the same trait, Jackson began developing genetically pure mutant strains.
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