Nature Explorer
for Android is an offline nature identification program for Android phones (and Windows)  with 12 free downloadable European nature topics...
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Birds, Butterflies, Moths, Insects, Mammals, Fungi, Wild Flowers, Green Plants,  Reptiles, Trees, Rocks, Fossils.
You may download as many of the nature topics as you wish. Once downloaded topics are stored in the phone's  internal memory for offline use in the field.
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  The app is FREE - No Adverts, No strings!
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Simply DOWNLOAD and OPEN -help Here
The Windows version is complete with all topics.
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