# toothless mammal with keratin scales

Fig. 12. Manus of Nqwebasaurus thwazi (AM 6040), Pelecanimimus polyodon… » Download scientific diagram | Manus of Nqwebasaurus thwazi (AM 6040), Pelecanimimus polyodon (LH 7777) and Harpymimus (IGM 100/29). (A) Right metacarpus of Nqwebasaurus in dorsal (extensor) view; (B) line drawing of (A); (C) left ungual I-2 (reversed) of Nqwebasaurus in lateral view; (D) left ungual III-4 of Nqwebasaurus in lateral view; (E and F) distal end of left manual ungual II-3 of Nqwebasaurus in: (E) lateral view, (F) ventral view. (G) Line drawing of manual ungual I-2 of Pelecanimimus in lateral view. (H) Line drawing of manual ungual III-4 of Pelecanimimus in lateral view. (I) Line drawing of manual ungual I-2 of Harpymimus in lateral view. (J) Line drawing of manual ungual III-4 of Harpymimus in lateral view. (K) Left metacarpus and proximal phalanges of Nqwebasaurus in ventral view. Abbreviations: cl, collateral ligament pit; dc1-2, distal carpals one and two; ef, extensor fossa; ft, flexor tubercle; fp, flexor process; I-III, metacarpals one through three; ics, intercondylar sulcus; kg, keratin g Researchgate.net

Glossary of Bird Terms » The following is a glossary of common English language terms used in the description of birds—warm-blooded vertebrates of the class Aves and the only living dinosaurs, characterized by feathers, the ability to fly in all but the approximately 60 extant species of flightless birds, toothless, beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart and a strong yet lightweight skeleton. Among other details such as size, proportions and shape, terms defining bird features developed and are used to describe features unique to the class—especially evolutionary adaptations that developed to aid flight. There are, for example, numerous terms describing the complex structural makeup of feathers (e.g., barbules, rachides and vanes); types of feathers (e.g., filoplume, pennaceous and plumulaceous feathers); and their growth and loss (e.g., colour morph, nuptial plumage and pterylosis). There are thousands of terms that are unique to the study of birds. This glossary makes no atte Encyclopedia.pub