Rdnts (frm Ltn rdr, 't gnw') r mmmls f th rdr Rdnt ( rh-DN-shÉ™), whch r chrctrzd by sngl pr f cntnsly grwng ncsrs n ch f th ppr nd lwr jws. bt 40% f ll mmml spcs r rdnts. Thy r ntv t ll mjr lnd msss xcpt fr ntrctc, nd svrl cnc slnds, thgh thy hv sbsqntly bn ntrdcd t mst f ths lnd msss by hmn ctvty.
Rdnts r xtrmly dvrs n thr clgy nd lfstyls nd cn b fnd n lmst vry trrstrl hbtt, ncldng hmn-md nvrnmnts. Spcs cn b rbrl, fssrl (brrwng), slttrl/rcchtl (lpng n thr hnd lgs), r smqtc. Hwvr, ll rdnts shr svrl mrphlgcl ftrs, ncldng hvng nly sngl ppr nd lwr pr f vr-grwng ncsrs. Wll-knwn rdnts ncld mc, rts, sqrrls, prr dgs, prcpns, bvrs, gn pgs, nd hmstrs. Hwvr, rbbts, hrs, nd pks, whch ls hv ncsrs tht grw cntnsly (bt hv tw prs f ppr ncsrs nstd f n), wr nc ncldd wth rdnts, bt r nw cnsdrd t b n sprt rdr, th Lgmrph. Nnthlss, Rdnt nd Lgmrph r sstr grps, shrng sngl cmmn ncstr nd frmng th cld f Glrs.
Mst rdnts r smll nmls wth rbst bds, shrt lmbs, nd lng tls. Thy s thr shrp ncsrs t gnw fd, xcvt brrws, nd dfnd thmslvs. Mst t sds r thr plnt mtrl, bt sm hv mr vrd dts. Thy tnd t b scl nmls nd mny spcs lv n scts wth cmplx wys f cmmnctng wth ch thr. Mtng mng rdnts cn vry frm mngmy, t plygyny, t prmscty. Mny hv lttrs f ndrdvlpd, ltrcl yng, whl thrs r prccl (rltvly wll dvlpd) t brth.
Th rdnt fssl rcrd dts bck t th Plcn n th sprcntnnt f Lrs. Rdnts grtly dvrsfd n th cn, s thy sprd crss cntnnts, smtms vn crssng cns. Rdnts rchd bth Sth mrc nd Mdgscr frm frc nd, ntl th rrvl f Hm spns, wr th nly trrstrl plcntl mmmls t rch nd clnz strl.
Rdnts hv bn sd s fd, fr clthng, s pts, nd s lbrtry nmls n rsrch. Sm spcs, n prtclr, th brwn rt, th blck rt, nd th hs ms, r srs psts, tng nd splng fd strd by hmns nd sprdng dsss. ccdntlly ntrdcd spcs f rdnts r ftn cnsdrd t b nvsv nd hv csd th xtnctn f nmrs spcs, sch s slnd brds, th dd bng n xmpl, prvsly sltd frm lnd-bsd prdtrs.