Sentence:  The nest itself , the structure that in some cases housed about 2000 individuals when the season was at its peak , is now rapidly destroyed by the scavenging <WSD>larvae</WSD> of certain beetles and moths . 
Meaning of the word marked with <WSD> tags:  the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose