long-tailed monkey
禺 centers on a long-tailed monkey, a specific animal reference with no broader conceptual cluster.
禺 is a pictograph of a long-tailed monkey, with the modern form preserving a stylized head (田) and body/tail (禸).
The top 田 looks like a monkey's face with eyes and mouth, and the bottom 禸 suggests a long curling tail. Together they form a long-tailed monkey.
For グ, imagine a monkey making a goo-goo sound as it swings by its long tail: goo -> グ.
hour of the snake (9-11am)