This entry explains idiom “Tang lang bu chan, huang que zai hou” from Zhuangzi. It warns that one obsessed with immediate profit may overlook hidden perils looming behind, as shown by the mantis‑cicada‑oriole parable.
A clam was opening its shell to bask in the sun when a snipe pecked at it. The mussel clamped down on the bird’s beak, and held it fast.