A sandestin is humanoid.

Ildefonse left the terrace and almost immediately sounds of contention came from the direction of the work-room. Ildefonse presently returned to the terrace, followed by Osherl and a second sandestin using the guise of a gaunt blue bird-like creature, some six feet in height. Ildefonse spoke in scathing tones: "Behold these two creatures! They can roam the chronoplex as easily as you or I can walk around the table; yet neither has the wit to announce his presence upon arrival. I found Osherl asleep in his fulgurite and Sarsem perched in the rafters." ...

"No matter," said Rhialto. "He has brought Sarsem, and this was his requirement. In the main, Osherl, you have done well!" "And my indenture point?" "Much depends upon Sarsem's testimony. Sarsem, will you sit?" "In this guise, I find it more convenient to stand." "Then why not alter to human form and join us in comfort at the table?" "That is a good idea." Sarsem became a naked young epicene in an integument of lavender scales with puffs of purple hair like pom-poms growing down his back. He seated himself at the table but declined refreshment. "This human semblance, though typical, is after all, only a guise. If I were to put such things inside myself, I might well become uneasy." Rhialto the Marvellous, by Jack Vance