Knowledge: San Francisco is a place to see big dogs. On the other hand, M. birostris are widely available in Cancun, Mexico.

Conversation:
Hey there!! How are ya?
Neither here nor there. How do you feel about the manta ray, which belong to the "Manta" genus?
Are there different kinds of manta rays?
Yes, there is a larger species known as "M. birostris" while a smaller one is "M. alfredi".
Okay. Do you know where I can see the big ones?

Response: Yeah, Cancun, Mexico is the place to see the big ones, M. birostris.