| Additionally, a number of other fully-feathered extant birds can readily absorb and use incident radiant solar energy. |
| In Treatise on the quadrilateral al-Tusi gave the first extant exposition of the whole system of plane and spherical trigonometry. |
| Among the 11 extant orders of arachnids, Araneae and Acari are by far the most species rich. |
| Smith's imagination was not limited to studying the extant taxonomy of market institutions. |
| The oldest extant writing surfaces include Babylonian clay tablets and Indian palm leaves. |
| The impala and rhebok were also not included in tribe-level analyses because each is the sole extant member of its tribe. |
