Comparison of the huge claws of <i><a href="//commons.wikimedia.org/wiki/Harpagornis_moorei" title="Harpagornis moorei">Harpagornis moorei</a></i> with those of its close relative the <i><a href="//commons.wikimedia.org/wiki/Hieraaetus_morphnoides" title="Hieraaetus morphnoides">Hieraaetus morphnoides</a></i>, the “little” eagle. The massive claws of H. moorei could pierce and crush bone up to 6 mm thick under 50 mm of skin and flesh.
(see above)
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Bunce M, Szulkin M, Lerner HRL, Barnes I, Shapiro B, et al.: <i>Ancient DNA Provides New Insights into the Evolutionary History of New Zealand's Extinct Giant Eagle.</i> PLoS Biol 3/1/2005: e9. <a href="//doi.org/10.1371/journal.pbio.0030009" class="extiw" title="doi:10.1371/journal.pbio.0030009">doi:10.1371/journal.pbio.0030009</a>