The leftover letters spell the message below.

O P H I P P O H A N D G O D S
A O L A W E V S E R Y T H I N
G L R A T H A I T H E H A L P
D M A A T A D F E A N D B I A
E H O O G Y C H E E T A H Z R
L D I T K N P L I B R E G A R
M O N K E Y A U R W A E S R O
N O I L V E C K S A R Y G D T
M O U S E A G O N O B D G I E
N E S I T S O D A W D B B O T
T N A H P E L E K C K S I Q Y
T L L Z Q Y O X E G O A T T K
CAT CHEETAH ELEPHANT
FISH GERBIL GOAT
HIPPO KANGAROO KOALA
LION LIZARD MONKEY
MOUSE PARROT PLATYPUS
RABBIT SNAKE TIGER 
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