Rat Varieties

Find the hidden solution to this question by recording the unused letters: 
What rat variety was recently developed in Australia?

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V E L V E T N R B C B D 
E O D F G A A U E H A W 
N U A F I I Y S R O R C 
O S L U E L A S K C E H 
M S M B B L L I S O B I 
A E A I H E A A H L A N 
N L T T O S M N I A C C 
N R I U O S I B R T K H 
I I O O D N H L E E N I 
C A N G E U N U G D I L 
E H R A D F L E S N M L 
D E T A G E I R A V E A 

 

AGOUTI
BAREBACK
BEIGE
BERKSHIRE
BUFF
CHINCHILLA
CHOCOLATE
CINNAMON
DALMATION
ENGLISHBLUE
HAIRLESS
HIMALAYAN
HOODED
MINK
RUSSIANBLUE
SELF
TAILLESS
VARIEGATED
VELVET