Where there's a will, there's a way

Me: Alan, you have endless acres of grass at your disposal. 

Why are you eating a tumbleweed?

 Alan: Tastes good. Besides, I like a challenge.

 Me: That tumbleweed is about 12" across. 

The hole in your grazing muzzle is an inch wide.

Do the math. It won't work.

 Alan: Tell me about it. So damned frustrating.

 Alan's perseverance paid off.

 He slurped up the tumbleweed like a string of spaghetti...

 ...until every last bit disappeared through the hole.