Its the big one not the small one this is a link of the nest
http://www.google.com/imgres?imgurl=http://www.windycityparrot.com/Merchant2/graphics/00000001/prevue11541155finchnests.jpg&imgrefurl=http://www.windycityparrot.com/page/Windycityparrot/PROD/89401101343 & h=386 & w=408 & sz=37 & tbnid=Auy3kEutuh9FzM: & tbnh=118 & tbnw=125 & prev=/images% 3Fq% 3Dfinch% 2Bnests & zoom=1 & q=finch + nests & ; hl=en & usg=__8ncVMB0Iv2ctvNegLdTzIBuBDJ4=& sa=X & ei=fGayTJaCKsKqlAfAhvTrDw & sqi=2 & ved=0CEEQ9QEwBg
parakeets use breeding logs. its a thick log with a circle in it the circle is to get your bird started on scratching the log. this log goes for about ten dollars its not hallow at all. try to buy one just to make sure u have te right kind of wood. here is a link to one http://images.search.yahoo .com/images/view? back=http% 3A% 2F% 2Fimages.search.yahoo.com% 2Fsearch% 2Fimages% 3Fp% 3Dparakeet% 2Bbreeding% 2Bboxes% 26sado% 3D1% 26ei% 3Dutf-8% 26fr% 3Dchr-atty % 26fr2% 3Dsg-gac & w=1024 & h=768 & imgurl=www.parrot-bird.com% 2FBudgerigar-box-nest-181.jpg & rurl=http% 3A% 2F% 2Fwww.parrot-bird.com % 2Fbudgie-pictures.html & size=179KB & name=...+% 7C + Parakeet + P. .. & p=parakeet + breeding + boxes & oid=95187848031281a9ffda18606d5a37bb & fr2=sg-gac & no=9 & tt=156 & sigr=11fcmhdp2 & sigi=11fhehien & sigb=13d0if14n just copy and paste sorry its so long! hope this helps