Preposterous! Everyone in the scientific community knows walruses only float on inclination, whilst their watermelon counterpart must rely on the fact that they are only fruit and cannot process the information of such a notion, let alone execute it! Besides, the gamma ray levels radiating from within a watermelon do far exceed that of a walrus' in a closed testing environment. Putting that latter statement aside, a walrus is in fact not hollow. Again, I say preposterous!
Good day and many more to come, mentlegen.