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activity adequate agouti albino gerbil amino acids animals areas Axelrod balanced diet Bartley bred breeder burrows Canadian white spot captivity carbohydrates cinnamon claws colony color strains D. G. Robinson deleterious desert desirable trait developed disease domesticated gerbils estrous fancy rat fats and carbohydrates feeding female gerbil fresh vegetables genes genetics gerbil species gerbil's diet Gilroy gnawing guard hairs guinea pigs habitat hairs hamsters healthy gerbil helps hindfeet hindlimbs hormonal inbreeding inches incisor laboratory litter male gerbil Meriones unguiculatus minerals Mongolian gerbil mutations necessary nesting material nutrients occurs offspring packaged pair parents periods pet shops Photo by D. G. Photo by Dr piebald predation problem produce proteins provide gerbils provide the gerbil pups rabbit pellets reproductive rodents roughage scent gland Selecting Breeding sexual shavings sunflower seeds tail Taterillus teeth temperature territory thumping tunnels usually variety vegetable matter vitamin weaned white gerbil wild young gerbil