1、动物世界主题曲是：《Just Blue》。

2、歌词：

Red dirt fields in Tennessee

Red dirt mud, slow wet feet

Red dirt clay stuck in my heart

Clogging up the way

The tears come through

Im blue, just blue

Pale gray sky above my head

Dark gray road，my rolling bed

Close my eyes，see you instead

Neon cafe sign across the street is glowing red

But Im blue，Im blue and theres not a thing to do

Im blue，just blue，just blue

Look into the windows，see whats caught my eye

Duck in to avoid the rain，a baby wants to cry

So do I，so do I

White and green，a few spring blooms

A reckless day in sparkle rooms

Paint my face and fingertips all rose and new

Still blue

Im missing you and theres not a thing to do

Im blue, just blue，just blue