The only mammal with true flight, and the hardest group to identify in the field. They leave no tracks: what works is the sonogram of the echolocation — the frequency of maximum energy, the pulse shape and the call rhythm.
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Mammaling is a free app for logging the mammals you find — the animal, or just its sign. Your life list grows with every new species, and the record becomes available to scientific and conservation projects.
Open Mammaling