Walter: The spread of the digits, V-shaped. It's too wide for one of those creatures. Configuration closer to that of an eagle. Of course much, much larger.
Peter: Hey, we're looking for Big Bird.
Walter: Don't be ridiculous. Perhaps a pterodactyl.

Walter: Check in on Agent Francis. Let's look in on our little friends.
Astrid: It didn't work.
Walter: Ever the pessimist. (pauses) Look.
Olivia: They're dying.
Charlie: What happens now?
Walter: Now you crap 'em out.

If my theory is correct and the bat traits are dominant in the creature, then yes, I believe we can successfully lure it. Whether we can survive the encounter is the more intriguing question.

Walter

Olivia: Walter, have you got any idea what kind of animal would be in a lab that could do this?
Walter: Well, judging by the wounds, I'd say two or three different ones, actually.
Peter: Right, a motley crew of lab animals got together and decided to exact their revenge on mankind.

Peter: Why do I get the feeling you're not telling us everything?
Walter: Because I don't know everything.

I've always wanted a two-headed goat. Where can I get a subscription?

Walter

Where's the fire? I always loved that expression, which is curious, since my lab assistant was killed in a fire.

Walter

Peter: You know, until this year I'd never actually been to a mental hospital.
Olivia: Learn to like new things.

Walter: That's a curious word. So it's got nothing to do with going underwater?
Astrid: No. "unsub" stands for unidentified subject.
Walter: Actually, it should more logically mean going above water.
Peter: And still no.
Walter: I certainly hope we find him. (whispering to Peter) Who we looking for?

Walter: What is mankind's oldest dream?
Astrid: World peace?
Walter: Oh, hardly. It's a social construct imposed by an awareness of our own mortality.
Astrid: Should have gone with "great taste, less filling."

Peter: She had a bad dream.
Olivia: No, I could smell the platform. I saw her baby staring at me. I saw her face before I saw the news. How is that possible?
Walter: Opium?

Walter: Astral...
Astrid: (correcting him) Astrid.
Walter: ...projection. Spirit walk!

Fringe Season 1 Quotes

Walter: It's a shame I don't have a lab. I'd like to examine him.
Peter: You do have a lab, Walter. Your lab at Harvard.
Walter: Yes. I do, don't I?

Just your average multi-national corporation specializing in secret bio research and defense contracting. Massive Dynamic. Seems like such an innocent name for a corporation, don't you think?

Peter