Who said "Stand on one leg that long? Any goose can."?

The Spartans (8th–4th century BC). Source: Plutarch, Sayings of Spartans, Anonymous 18 (233b).

What is the original Greek?

τῶν μέντοι χηνῶν οὐκ ἔστιν ὅστις οὔ. Translated from the original Greek by Spartan Surfers.

Stand on one leg that long? Any goose can.

The Spartans, Plutarch, Sayings of Spartans, Anonymous 18 (233b)

The source

"Stand on one leg that long? Any goose can." The Spartans said it in Plutarch, Sayings of Spartans, Anonymous 18 (233b). Translated from the original Greek by Spartan Surfers.

"τῶν μέντοι χηνῶν οὐκ ἔστιν ὅστις οὔ."

Original Greek, Plutarch, Sayings of Spartans, Anonymous 18 (233b). Greek: Bernardakis 1889 (Teubner) via Perseus.

Who said it

The Spartans (8th–4th century BC). Laconic sayings from Lycurgus, Leonidas, Dienekes and the mothers of Sparta, recorded by Herodotus and Plutarch.

Questions

Who said "Stand on one leg that long? Any goose can."?: The Spartans (8th–4th century BC). Source: Plutarch, Sayings of Spartans, Anonymous 18 (233b).
What is the original Greek?: τῶν μέντοι χηνῶν οὐκ ἔστιν ὅστις οὔ. Translated from the original Greek by Spartan Surfers.