Cape lappet moth
... that caterpillars of the Cape lappet moth are described as "gregarious" because they clump together in great numbers for unknown reasons?
... that <a href="./Caterpillar" id="mwCIY" rel="mw:WikiLink" title="Caterpillar">caterpillars</a> of the <b id="mwCIc"><a href="./Eutricha_capensis" id="mwCIg" rel="mw:WikiLink" title="Eutricha capensis">Cape lappet moth</a></b> <i id="mwCIk">(pictured)</i> are described as "<a class="extiw" href="https://en.wiktionary.org/wiki/gregarious" id="mwCIo" rel="mw:WikiLink/Interwiki" title="wikt:gregarious">gregarious</a>" because they clump together in great numbers for unknown reasons?