i Register
In some senses, crestie is marked as informal. Watch for register when choosing this word.
noun
A crested gecko (Correlophus ciliatus).
"Cresteds," or "cresties," as they are commonly called, are docile in nature and relatively calm and easy to handle as pets.
More recently, crested geckos have become the "It" reptile pet. […] Corn snakes are popular to this day, and I have no reason to think that cresties will not continue in popular favor.
A crested tit (Lophophanes cristatus).
A great crested grebe (Podiceps cristatus).