题目内容：
请根据以下内容回答题：HoneyfromtheAfricanforestisnotonlyakindofnaturalsugar,itisalsodelicious.
Mostpeople,andmanyanimals,likeeatingit.However,theonlywayforthemtogetthathoneyistofindawildbees'nestandtakethehoneyfromit.Often,thesenestsarehighupintrees,anditisdifficulttofindthem.InpartsofAfrica,though,peopleandanimalslookingforhoneyhaveastrangeandunexpectedhelper-alittlebirdcalledahoneyguide.
Thehoneyguidedoesnotactuallylikehoney,butitdoeslikethewaxinthebeehives(蜂房).Thelittlebirdcannotreachthiswax,whichisdeepinsidethebees'nest.So,whenitfindsasuitablenest,itlooksforsomeonetohelpit.Thehoneyguidegivesaloudcrythatattractstheattentionofbothpassinganimalsandpeople.Onceithastheirattention,itfliesthroughtheforest,waitingfromtimetotimeforthecuriousanimalorpersonasitleadsthemtothenest.Whentheyfinallyarriveatthenest,thefollowerreachesintogetatthedelicioushoneyasthebirdpatientlywaitsandwatches.Someofthehoney,andthewax,alwaysfallstotheground,andthisiswhenthehoneyguidetakesitsshare.
Scientistsdonotknowwhythehoneyguidelikeseatingthewax,butitisverydeterminedinitseffortstogetit.Thebirdsseemtobeabletosmellwaxfromalongdistanceaway.Theywillquicklyarrivewheneverabeekeeperistakinghoneyfromhisbeehives,andwillevenenterchurcheswhenbeeswaxcandlesarebeinglit.
Whyisitdifficulttofindawildbees'nest? A．It'ssmallinsiz
B．It'shiddenintree
C．It'scoveredwithwa
D．It'shardtorecogniz
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