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<div class="gmail_default" style="font-family:garamond,times new roman,serif;font-size:large;color:rgb(11,83,148)">Hey Kit- I don't know a way to do this for several reasons. You point out one. Another is the mother bee will block the passage of a probe down her burrow (resolved by waiting until she exits the nest). Worse, most tunnels have one or more "kinks" in them and you never know if a probe has stopped there or made it past.</div><div class="gmail_default" style="font-family:garamond,times new roman,serif;font-size:large;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:garamond,times new roman,serif;font-size:large;color:rgb(11,83,148)">It is handy, however, to have an idea if it is going to be a deep nest before you commence digging. For this I use a thin, flexible flowering stalk of a grass, stiff enough to push, flexible enough to bend without kinking and folding. If I can slide it down the burrow a good distance, then I know that I can shovel away top soil layers and that I had better prepare a bigger hole to the side for a deeper dig.</div><div class="gmail_default" style="font-family:garamond,times new roman,serif;font-size:large;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:garamond,times new roman,serif;font-size:large;color:rgb(11,83,148)">yours, jim</div>
</div><br>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div>James H. Cane<br></div>Native bee and pollination ecologist<br></div>Emeritus USDA-ARS Bee Lab, Logan, Utah</div><div dir="ltr"><br>
"Knowledge and comprehension are the joy and justification of humanity"<br> Alexander von Humboldt</div></div></div></div></div></div></div>