IME, they typically keep their tail ends deep inside their burrows and extend out to grab something to eat. Upon grabbing whatever, they retreat QUICKLY (blink and you'll miss it) into the burrow. I think they would prefer to take items that are small enough to disappear right inside, but you might also see something pinned up against the entrance.
Also, they don't poop in their burrow...Every now and again you will see the forked tail stick out of the burrow for a quick poop! They have no problem doing a U-turn along the length of their body within the confines of their tunnel.
I suppose the point is, you rarely or never get to see the entire worm at once. In fact, to this day, I really don't know how long my largest worm actually was. At least 2 feet, but maybe more.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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