Answer:
I am a busy worker who is a water mammal.
Forward I am heavy backward I am not. What am I?
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
What word when read from left to right is a ruler, but when read from right to left is a servant?
What do you get when you cross a snowman with a vampire?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.