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Some species nest in crevices or burrows, a few in trees. Many are colonial, with
aggregations run- Breeding ning to over a million pairs. Sex reversal, in which
the habits of female is more brightly coloured than the male and takes shorebirds
They assemble at communal display grounds (the arena or lek) where each bird
occupies and defends a site during the day; occasionally, an "apprentice" male
may be permitted to share an occupied site. Females visit the lek briefly and ...
In some (perhaps most) horn- in of the bills, however, the female enters the nest
cavity before female laying starts; the male brings mud and debris, which the
hornbill female takes and plasters around the entrance until only a slit is left.
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review