 ዳሩግን እንዲህ ያሉ መጻህፍትን አሳድዶ የማንበቡ ተነሳሽነት የሚታየው በአብዛኛው በሙያው ሰዎች ወይም በጉዳዩ ልዩ ጥናት በሚያደርጉ ሰዎች እንጂ.
Many of the observations Darwin was sent were from amateur observers, rather than from people who had made a special study of the subject.