Well, you had to poke and prod. Consider that you brought this on yourselves.
As you land dwellers do not call your familiars and domestics ‘air dog’ or ‘air cow’, please do not refer to the Softs of Rebma as ‘aqua cats’.
Generally, the cats of Amber are deficient of voices and do not sing. They have territorial manners similar to Softs, but a cat’s claws can always be found on its paws and Amber cats do not walk in and out of mirrors.
In Amber, misunderstandings with cats are said to lead to bad luck or scratches. Indeed, in the shadows there are reflected some serious supernatural powers associated with Amber cats, including in some parts that women need not marry a husband, or might fly a broom if a cat is so inclined.
In Rebma, speaking to a Soft often precludes any misunderstandings. Befriending a Soft, can lead to a life-long drinking companion and you may be invited to sing-a-longs, for which Softs gather on almost a weekly basis. Whales often swim in to add their voices to the Soft Choir, especially those holiday times of year. Softs do not fly, but they are excellent swimmers, of course. Softs do not marry, and honestly why should they? Brooms are stupid and no Soft would tolerate one in the house.
While you can never find a Soft’s claws, they are extremely potent, and capable of rending all metal, except for gold and silver. A Soft in a fury may actually manifest hidden claws larger than the entire size of the Soft. There is no truth to the folklore that Softs can become invisible or wield magic (though again, in the shadows the rules are very different) but Softs are known to read futures, and drag the occasional dead guisel home from a mirror adventure.
Best information on Softs, including the care and friendship of, can be found in consultation with the Navigator Guild of Rebma, which history informs, was founded by the Soft Klepto, once beloved of Lir.