Strangely, however, insects and their like are not the
favoured food for wasps. Sugar from flowers or fruit is their basic diet,
making them accidental pollinators or they eat the sugar produced by larvae
in the nests. But once they have young to feed, they switch to the
invertebrates, moving as most dieticians would advise, from carbs to
protein as they rear families in nests which can be as large at 10,000
strong.
As we probably have all experienced, wasps have a painful,
but generally non-fatal sting that they deploy, as with most creatures, by
way of defence rather than attack. However, unlike bees that die after
inflicting a single sting, wasps are able to sting multiple times and live
to tell the tale. You may also wonder what is the difference between a
hornet, that has a far more painful sting, and a wasp? There is in fact
none. Hornets are simply large wasps, growing up to 55mm in length compared
to a more normal 20mm. However, if the size does not give it away the
easiest way to differentiate the two is that hornet colourings are brown
where a wasp would be black.
It seems wasps are not particularly fussy about where they
nest: buildings, log piles, hanging from branches (pictured) or in the
hollow of trees …… in fact, just about anywhere dry, safe and sound.
However, nowhere in my research could I find a specific mention
of river banks so my best guess is that as the late summer population
explodes wasps have to seek out new, but secondary nesting sites which sees
them occupying the now-dry-but-vacant homes of voles, moles and other
burrowing creatures.
Of course, I could well be wrong so if anyone has the
definitive explanation, I’d be delighted to hear it. In the meantime, go
carefully along any riverbank!
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