I noticed that a user uploaded the same image, once under leaves, once under fruit.

If they had cropped the image so one photo only showed leaves, and the other photo highlighted the fruit, they would not look like the exact same image. That would make sense to me...

Is this practice done very often? I am not sure I have seen the exact image uploaded twice like this before.

See photos uploaded by hawkarica under the following:
Sweet Bay Magnolia (Magnolia virginiana)

Thank you for finding this. I've deleted the one in the fruit gallery. We already have several fine photos of the fruit.

No, this is not a common practice or an accepted one, so please alert us if you ever see this again.

It seems like dave could create a bot you could run through the database periodically to catch those.

The system usually doesn't let someone submit the same image twice, but these probably were entered in such rapid succession that the system hadn't yet registered the first one when it processed the second one.

Ok, thanks Zuzu!