The hamster would most likely kill the gerbil before they would have a chance to "fall in love". Hamsters are solitary animals and very territorial. A gerbil, although a different species, would be seen as infringing on the hamster's territory. Also, a hamster is likely to eat a gerbil once it kills the gerbil. I highly recommend keeping the two separate and, therefore, safe from each other.
Source(s):
vet tech and director of Rascally Rabbit Rescue and Critter Haven of Arizona, Inc. www.rascallyrabbitrescue.org

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