The Beetle does not select his head of game, choosing one in proportion to his strength, as do the predatory Wasps; he accepts it as hazard presents it to him.

Among his finds there are little creatures, such as the Shrew-mouse; animals of medium size, such as the Field-mouse; and enormous beasts, such as the Mole, the Sewer-rat and the Snake, any of which exceeds the powers of excavation of a single grave-digger.

In the majority of cases transportation is impossible, so disproportioned is the burden to the motive-power.

A slight displacement, caused by the effort of the insects' backs, is all that can possibly be effected.
Ammophilus and Cerceris, Sphex and Pompilus excavate their burrows wherever they please; they carry their prey thither on the wing, or, if too heavy, drag it afoot.

The Necrophorus knows no such facilities in his task.