encontré una discusión en un foro (el link muy bueno tambien)
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Comparing the two, I found the major differences to be…
‘iBird Explorer Pro’ - Much better search and sorting capabilities than the ‘National Geographic Handheld Birds’. You will get to your bird quicker with this application. Also includes photos while ‘Handheld Birds’ does not.
‘National Geographic Handheld Birds’ - More thorough illustrations when examples of juveniles/immatures, females, or hybrids, are needed. Illustrations also contain field mark notations, while ‘iBird Explorer Pro’ does not.
Both contain playable birds songs. The Nat Geo songs come from the Cornell Lab of Ornithology.
If you are interested in more detail, the test results, with the criteria used, can be found here…
Birding Field Guide Reviews.
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este ultimo link resume rapidamente con lo siguiente:
“Hands down the “National Geographic Handheld Birds” and “iBird Explorer Pro”. These software applications have more textual content per bird species than any of the printed field guides above. Both include information on foraging, nesting, range, habitat, appearance, and voice. The illustrations and photos are good. National Geographic Handheld Birds has the better juvenile/immature, female, and hybrid illustrations, including field mark notations. While iBird Explorer Pro has the better search and sorting capabilities”
