Tim holds one of the smooth rocks up and calls out, a little
TIM: These look kind of familiar.
GRANT: Triceratops was a constant browser, and constant browsers would be constantly sick.
ELLIE: Constantly sick.
GRANT: Not just every six weeks.
ELLIE: Yeah, I know.
TIM: I've seen pictures of these!
Grant turns and looks at him, a little annoyed.
TIM: In your fully illustrated book.
Grant just rolls his eyes, but Ellie comes over and checks out the
ELLIE: What's that?
A light goes on in her eyes.
ELLIE: Alan – gizzard stones!
She throws Grant one of the stones. They look at each other in amazement.
As before, when they get excited, they talk right over each other.
GRANT: Elm that's it, it explains the periodicity, the –
ELLIE: – the undigested state of the berries because it's –
GRANT: – totally incidental (or) unrelated to the feeding pattern –
TIM: What are you guys saying?
ELLIE: (turning to Tim) It's simple, see. Some animals like her, don't have teeth –
GRANT: – like birds –
ELLIE: – like birds. What happen is, they swallow the stones and hold them in a muscular sack in their stomachs –
GRANT: – a gizzard –
ELLIE: – which is called a gizzard, and it helps them mash their food, but what happens after a while –
GRANT: – what happens is that after a while, the stones get smooth, every six weeks, so the animal regurgitates them –
ELLIE: (for Tim) – barfs them up –
GRANT: – and swallows fresh ones.
ELLIE: And when she swallows the stones, she swallows the poison berries too. That's what makes her sick. (impressed) Good work Tim.