chalk! find entry points draw a fence! they will pop out elsewhere fence them in. Be clever draw a road from entry point to entry point and watch them go round in circles. Fun and not at risk of killing a possibly sentient life form. Then theres salt.

how about crediting the source which can be viewed at WWW.Lspace.org and in a readily viewed form. Oh and Eric is in a marvelously illustrated edition

Hows this for a wild dream based on possibilities and the BBC going back to its "what the hell great idea" years.