Possible improvements

There is always something to improve.

Disable automatic texts updates

Application could offer the user to disable automatic updates of texts and images.

Publish texts and images in "more opendata" form

Although this feature would have to be implemented on the DB server side, it is still good to mention it. Having data easily accessible in more "user readable form" is always better for new potential developers.

GPS helper

According to actual position application could offer information about nearby animals.

Gamification

Bring some interactivity to users. Like sharing photos - best photo of the month will get a free ticket for a next visit.