Cut it in half

We're eating pizza and talking about my two finches. My poor male birdie, Huff, recently died. We picked up another society finch, but we're still trying to figure out the gender. We're pretty sure it's a girl, though, same as my other (zebra) finch, Puff.

Now, some eggs were just laid (which I suspect the new bird laid). My mom asked if they were both sitting on the egg and I answered that they were. My mom says that we will have to get another bird, now, and my sister and I agree. There's a moment of silence as we chew our pizza. In my sister's defense, she's staring at the T.V. and so she missed what my mom and I are doing. I'm staring at the pizza, which had huuuuge slices, and debating taking another. So, my mom tells me: "We can cut that in half."

I start to nod in reply, but my sister looks up in panic and asks: "The birds!?"