Blight

Quickly, I need it!
Shipped in a day, oceans away
I'm willing to pay
To get the best that I can
The best that I can get

I've got to feed it!
High in demand, short in supply
I'm not a bad guy
I do the best that I can
The best that I can do

Caterpillars hatching
Swinging on thread with fanatical spread
They need to be fed
To get the most that they can, the most that they can get

Defoliating, chawed up trees
With skeletal leaves, a many-legged disease
They do the best that they can
The best that they can do
Sleeping and sated, nesting on the bark
Evolving in the dark, prepared to disembark