Matsya Purana 256.18

256.18

aṅkanānantaraṃ yatra hastyaśva śvāpadaṃ bhavet.
tadaṅgasambhavaṃ vindyāttatra śalyaṃ vicakṣaṇaḥ .. 256.18

When an evil omen occurs eg a vulture shrieks, facing the sun or it touches some part of the body of the owner, it is to be understood that on the corresponding portion of Vâstu underneath it there is the bone of an elephant or of a terrible carnivorous animal, indicating danger—16-18.