Myrmeleon crudelis is one of over 2000 species of ant lion.
From the newscientist.com
Each ant lion digs a cone-shaped pit in the sand.
From the newscientist.com
That's because fine grains remain more stable on steeper slopes than large ones, so this selectivity allows the ant lion to build a pit with steep sides.
From the newscientist.com
Even though wildlife was relatively scarce, we still saw a wealth of fauna including greater kudu, the agile klipspringer antelope, fish eagles, the voracious ant lion and shy pancake tortoises.