Bird Pro by Mitch Waite Group, a bird reference guide, joins the Android Books & Reference App Top Ten list this week at No. 2. The app was released in 2009 but has recently been updated for tablets. It appears on the list for the first time since we began tracking Android book apps back in May. WolframAlpha is still the No. 1 app on the list.

To prepare for Mediabistro’s upcoming Publishing App Expo on December 7-8, we will be spotlighting the top grossing book apps every week–helping our readers discover and analyze successful content.

Below, we’ve listed the top ten paid Android Books & Reference apps of the week. We’ve linked to the online pages for the individual apps so you can explore the content.

Top Paid Android Books & Reference Apps

1. WolframAlpha

2. iBird Pro

3. iKamasutra

4. Moon Phase Pro

5. Aldiko Book Reader

6. Moon + Reader Pro

7. NIV Bible

8. Garmin Nuvi

9. Terra Time

10. Our Daily Bread