These lines must indicate that young-hearted fiends are nearby!
With no relation to the Antlion in the Half-Life series, these creatures are well known for their sand pit traps which comprise of capturing small, unsuspecting creatures in a rapidly decaying pits. It all starts with a humble-sized larva and its basic instinct in the big, bad world. The larva would dig a pit into the sand about 2 inches deep and 3 inches wide at the edge, creating a downward-facing cone shape in the sand. (Unless they manage to bend the laws of physics and make the sand particles stand with magic.)
Luckily for you, these are the video game versions.