H tu MITTEITUNGEN U v) hl )-1 fYl ORNITHOTOGISCHE v) rYl
(Yl ARBEITSGRTJPPE F Lanioturdus rorqurtut Drosselwiirget SCHRIFTLEITUNG:POSTFACH 67, WINDHOEK, S.W.A. : H Nr. 5-6 lB. Jahrgalg Augus t/'september 1982 H Q z(t) lY) U) ilO1I I.{ELL DO YOU IiIJOh' T}IIS B-TP.D? (r) 2 B South African She.lduck Graukopfgans Bergeend
TADORNTi CAl.lA (Rouerts \Jo. v)n 9O) Ident ifj-cat ion zl {lccrlr,s j-s FI This large ches tnut-c olourecl duck at dams and v1e vl wtrere the rvater is sha.Ilort' and there arql stretches of wet nlud. F{l zl Adult fema]-os ha\re a varia.ble amount of rshite on the face and a grey neck. Adult mal-es an.d. both the young (fess than ej-ght nronths o].d ) nrales and fenrales hawe a grel/ he.ad and neck. Shelducks are likeJ-y to be confusecl with onJ.y trro other species' Mcst confusion occur:s rcith Egyi:ti-an Geese (R 89) wkrich are similar in sj-ze and especieilly in flight patterrlo Roth Shelduck arrd -"*hite EglSian Gcese have Ulack(is} ) flight featkrers an-d a shoulder. Tirey are best seper.iteC. ivhen standing or swimniing when tkre differ- ence in colour is nost obvious. TLre Egyptian Goose is duller in colour wj-th a greater cor-rtrast irt colour betrreen t;he dark back and pale '-rnderparts, whereas Shelduclrorri:l ri-n61 on the neck of Egyptian Geese is a mark that oan often be used to distinguish these species in f light. Adult femaler Shelduclcs i:li11,irt, because of the white on 'be their face, confuseC with rlhj Le--facecl Ducks (p- fOO) . However, Shelducks are consirlcrably larger, lighter colourecl and have conspicuous rvhitc l.,a'cches on ttre shor-rlder lvhereas ithitefaced rn'ings (see P.oberts t{ Ducks are sriralJ.l clark ancl have no rr.hite on tkrei rrl Ptate 9 irr iato-st er.-lition. ). U General- introduct iorr v) a This harmloss sirocies, which fer,-.ds lzrrge11'on v(,rgetable tnattc-rt l*l is forrn
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"flresc oxt'r2. -rvir1,or b()c,i,L(:)st ,n'ctJ s;() ()tl:,r.i-.lt-r.i i,l;-i.-rr !-lai)ociest to al ..havc i-ttcLr,'as<: .Ll,s L'irn/lc i,'ibhLn t..r.:riaiititt/:.:,it.,'-1.t.-Lc;l.
\{L ii ,\' rr.l I i'lTLi:, i(rrOl,'LEtlr-}li ['t"i l':,],-: r; ii,\i,OGY OIr' 'lil-i-;-: l, l)ii(l i-trS lj,lTHfii liltlil;jj.1 ,1.//'-,.r:..',.i:',?l.(.),:,. ,,1y i,r;,:., ; 'ici ()r,.1,1 ,, l'l,li c'-l i'1-l; ;i,i"i\lPLE oll:'--li--ilv.,.i- " 'J'() l lOi\i:l \ii)i' (,-::; it,',.-:-l,L'i;ril!- i) L;:., illir'..illJ \'Oiji.i -,1.1lJ'.)i.Il iiirOij],jiDC;E.
The res'L oJl tiii,:r iii't.i.c1(,rf .i1, is l,opccl , i*il1 !)r()vi-cL.r i;iie t'iocessary inf ortiiat i cri. zrllcl, s b i:irtilus llor' ]-()l.l il o 8o o r,rt anrl nal.lc obs e rr.iet ion.s on ttrili rrilcc j ()s.
Distlibub-i-on j-btr-Lion Tlle .-icccirrtji:i.Lr:y'.j.ril-lrl.rl) sirr-r-,i:r l,f1gl .lis tr. of i.)csiti\r.l rccor(ls 'b1lis 'i-r-i.t.-rl of i:lj.)i-rc.Leli slrbl:iittt.'ri f i)r: tll,-: a'l, 1-as; r:r'o jecl; to cl:rte. Noto, l-l:..t ti:i' s(i1-ra.I'().'i ()jI'l,iio irl;ll-r ,1f.'\.)i-l . r'r'r.r' s(luierI-('s ancl c)ach of thcscj contair:. .t-(i a1l-.Lrls s(jllarri)li. Pliic(.) i:rffnes] ar](i. dcgrccs i.ir'c) giwen. f or or:'i ori t, e t -L,rn . 'j So f ;,ir if(' itar-t'r. rc)cor(;.J:r O1- l, ftir: sjJ)ijot.irS i'I.r-rrti On.l-t /t S(lt1z:i.fcs 1ri:t zrlreaclT" h() irirvc r,rdLic(l i-l:inrcrlr;t:1'r. t,o our l
This s uocics lt;.Ls ali tlrrC'von ;jc-\ r;,:1tio.
;liciul,1, r ra'! c :rti11 1'r,uir 1-rr ,-:11'.,-l-cll;r-:; lts :).1'c c.:lr-:,l -l-Y ciis; t irr g.r,Lsl.rab1c'. -t-11.. l-(ltra!loS i.:r.vo itili,lrt\ aln .i'irt:r.' ir-.fi.L-1.:;tj iri.i.lc s (;-.nri aJ-s o yoil]rg j,iii_,,(l b.i.rcis ai, I.tot.ll :ti-_xc j:r) ,iri it,[ .l_ iir.i)-,' ]t.-r;.r.clilnll r'icok.. i"iot;o t; Ii:rt j-r.'ci 1,-oulril b r:i ci' :;:tir s.r-\ i:rji I'i: l.rllrirli-r 1;lt,-r rir.-'i-l-c, irr havin61 nl1 :r"11 gre-v*. l:r::ic1 altL(1 llciCl{.. I'll i.S r;.l i- irz'"i.i-on. il.; vol"v r;'lttr:.:'.-r1:i LJrci, irr
'-)/ , r.... r... t- / ') flr. )-o _:,t--it. _ mOst :ir-fi)cics v,'lrar-r:'c)i}:.'r'.-: i..; -r riif i,.,':'ct't(;i.: iIr (:of crl:'nti olt llo"l-'*r(.-L'n rht-- aciuf i, t,la.lc:i itrrrJ jlirirt,.l-l-cr; 1.i:<, .,;{)r-:ll,r.'t-rirc: } ,l:'c,56-.;;1:-,lg' i-,:,,. t'orrft I cs .t,..c,. n().L i:lefcll .
1'he ,'\frit;a.n She.]-cluch i-s :t-l-so irnusl-rii-L ooqr--.1;c1'. ',11,'f u;rst -Ln !ior,lt1r j.'-Lr.r<;ks; lr;-:.,'r-' Afrlci'1 , tvltc:rc'r"e-r: 1;::::g+r l;eort obsc'rvc,'cl lhcrc llatrr: al- <.".' -u-ir:r;'i. I."'aiis bcc.:'L .i:-,-i: niel'(l 1;i-i i.rs-', iaiii-1.()s. -..-L1;hoLliii-I v€. woti]-r-l cxplctj 't' ?- si.tr,iJ.c;- si i;rll:.ticr: r,i::.i;.iitt.;:/:r. .---ft'ici,r 1;h,i-s rtai' ttot ]>e :--io. i lino\r' o.l.' no I)ut--ii-sirc
Brcj: d in; i 1,.io l- o Eli 1{c
Iiee molilt
]Jelcii j/ca)r:' ::.i-;:tost a-Li b--r:ciri l;-r'()1,,,. ci:lil1-rlqj'[e-Li- ,rcrr :;,:t of |L)€'. 1.i.1e1'a:j. Si:el-ducL'.s ritr,r:iti1; .1-1 lo-i:r iitoiill Ioq5;i) sju r:lillry 1 -i,,i-1;i:1,f i:..itircrs; at one tirnO tiri'l-l, i;ht-.j' l-'-;cCr,)rir(rfJ i1;,ri j,<:sl; j'-,,r' s;.-'i,r'b1- :--.i, r;iich t-'i I.ie .r.iocl " they r,:lc)a/ctto J-lrgc i.r>s of' ..-'il,olt lr':_lt;r:r' l!ri]\-r1'<; l,irc-7 calti s\ii.iil ,;uC: 'l.c arllii-)' f::o;.1 ti'.le sho'rc-. ir,wo.i-d i-,ro11art;o:rs. ,.t t--i,s tiino o.i- tl:er -1'c:ir gonoral]-y iTovrl;rtbe,'r 1.;() .ir:lrlrar;.,r .i-r-rr-lor.i-l,il -,.i'.r'.icrr. tirolli;h i:.9:.i-ir this could bc diff--t'r.rrt; i1(,)r(.) ',1rltot'c. .r:-,-Lri:, a.r(-- 1it-tr-r' -.t; i...c lar.gcst l'1oclbirds |:otii lr c,rr Lir- .l-i.'::,1c,'-,,. lrs i'l s ea',it oJ' cirrir, t--itr6-ir,:r'i i:i f ::ans-rriir i and Soubiiwestc,.r'n (-l;ii-.iit/S.''.--ifric,-,- inciicatc.
L|/ Nr. ';-6 :ier-1;c 4
I",'hat you can c1'-,
1) sel-lcl us in a,t1as rc.<;.,rrcls .rf l-lhe.1,-luck occurrence.
2) ccunt flocks of Shr,:lciuck aitcl p;,rrticul;rrly the numtrer of ',*hit<_. 21t] i3r(,\y hc_-i,.cls.
3) rnirke ::eccrcis of rrhen -vour l-ocrr-l- birds moul-b an ,i1l cor:rtributic;n.s rvill be;icl..nor{f(.rcigecl ?-in-dir() hope to be abJ-e 'L:-if.-rrmabion, to v,'rite, $31!;g\c[ i)n ]/rri-tr" somcl'bime next year a j-rnc, IJaper (afte r yon ha.vc- i to rr::l{r,- .-an-l sertC in your observations ) . DCNrT !-ti;iGIiT lfVEl'r VERY Sl.i'iFj-,ll C;:,E]1V;I'TION:i, ftr C;JTEFLTLLY 'iO l{,"iI)E r CAi.i ,'iDD ()-uli?.iti{OlirL[']llGll O;r X'IITll SPIICfES I Dr. A,J. iJil-liams, S,:,rnior Cur;-:trrr: OrnithoJ.ogyr State l4useum, P.O. Box L2O3e iflntll.oek,9OOO. Pubf ished r'.ith the pe.rl;ri,s s ion cf IuL. Sccrctarry f or i\ational Ecluc at r on , Rofer to map. a-a-a-l-t ^us einent Brie.f rroit }ie::rn ]rrof.,Dr.Id. 3r:;:.belsmann, Pietera- btr::g; r,Tv-}. * : ,,ZunS.clist r,russ ich rr'i>hl tl,ie :r-uf 11iescr lieitc iingebrachten Abbilciungerl crliiutcrn; i;c jde ,''ufnahnon rnerchto ich clurc}. die Glastiir unserer Verancia voir e-i-nem Spor. nl 5./" , ...... T