METHODS ni- j;ii;i) .STUDY 45 



Wlii'U (lepri'<lalit)iis on ilic iioiillr} }anl or dislurljaiR-f 

 ainonci;' small l)ir(ls is luaikccl, it is all but certain lliat ('itlicr a 

 sharp-sliinncd or a ("oopcr's liawk is caiisinq' all ilir iMiscliifl'. 

 riicsc two. of the connnoncr liawks, teed alnio>i cxclusiNcly 

 on other birds and briniu;- prat'tically all tlic popular ill-repute 

 upon tlie rest of the family. In addition (o tlicsc, tiie Anu*r- 

 iean goshawk, a("anadian species ^^'hi(•ll cnteis the Xoithcrn 

 States in winter, feeds largely on game and poultry ; and the 

 rarer duck hawk, seldom seen far from the coast or lar^-cr 

 waterways, feeds chietly on waterfowl. 



Some authorities are intdined to maintain that the smaller 

 species, sparrow and pigeon hawks, may prove useful in towns 

 and cities in destroying English sparrows. This is a good 

 problem to assign, if some of these birds arc known to nest 

 in the neighborhood. In the oidv case known to the author a 

 pair of s|)arr()W luiwks which nested on one of the buildings 

 of the Worcester Polytechnic Institute had linallv to be shot 

 on account of serious inroads npon the \aliiablc bird lite ot 

 the campus. Connnon tyi)es are: 



Marsli haw k — < 'Ircus hmlsi'miiis. 



Sliarj>-sluiin('d hawk — Accipiter nlnx. 



Coojter'.s hawk — Art-i/Hter codjuri. 



American goshawk — Asdir ti/ricd/n'l/us. 



Red-taih'd hawk — lli'tti <> hiu-Ki/is. 



Ked-shouldered hawk — liuteo linedtns. 



Bald eagle — II(ill(r('fns kticocephalus. 



Duck haw^k — I'Wro /xref/n'nus dtuiimn. 



Piii'eoii liawk — Fdl<-<> i-olmnhdrins. 



S)>arn»w liawk — Fdh-o s/xd-n'rins. 



Ajiu'rican osprt-w <>r fish hawk-- I'mulnni liali<t,ius rtini/int nsis. 



Screech owl — (Hus dsio. 



Great liorned owl — liiUxt riniinidmis. 



Order Coccyges (coccyx^ "a cuckoo"). These are among our 

 most valuable birds as destroyers of hairy cat«'rpillars, an<l on 



