The inside of any ear upgrade can be any colour already present on your Mormorian. Similarly, if the ear has fur on the inner ear it too can be any colour already present. The following ear upgrades can have fur: Round, Prick, Half-Prick, and Droop. All Bouiboa examples have the ear tie removed, they can still have the ear tie with any ear upgrade. Ear upgrades on Bouiboas make the second set of ears into a smaller version of the larger, main ear.
No Ears
How can they hear? EXP Needed: 10 Requirements: None
Round Ears
Round like a bear or lion! EXP Needed: 50 Requirements: None
Prick Ears
Pointed and upright, can have fur or not EXP Needed: 80 Requirements: Must be two months old
Half-Prick Ears
Prick ears that fold in the middle, can have fur or not EXP Needed: 90 Requirements: Draw them with an official Mormorium animal or pet
Folded Ears
Full fold, all cute EXP Needed: 100 Requirements: Draw your Mormorian scratching their head
Droop Ears
Like a hound! Can be furry or not EXP Needed: 110 Requirements: Draw them with an official Mormorium animal or pet
Webbed Ears
Suited for all those swimmers out there! EXP Needed: 100 Requirements: Draw your Mormorian swimming!
Feather Ears
Feeling light as a feather! EXP Needed: 110 Requirements: Draw them helping another Mormorian!
Tufted Ears
Ears with little hair tufts are the tip, ear fluff optional. EXP Needed: 200 Requirements: None
Wing Ears
Can be webbed or feathered wings! Cannot be used to fly EXP Needed: 300 Requirements: None
Axolotl Gills
Doesn't really help with breathing underwater though EXP Needed: 350 Requirements: None
Butterfly Ears
Ears that look like butterfly wings! Can be any color! EXP Needed: 400 Requirements: Draw your Mormorian in a field of flowers