What does it mean that "cranes cut the lean meat on their legs and mosquitoes scrape the oil on their bellies"?

Cranes split the lean meat on their legs;

Egret, also known as Egret, was also called "Silk Bird" in ancient China. It is a very beautiful waterfowl. They are naturally beautiful, white and slender, and often stand alone in the water with one foot, relying on flexible necks and harpoon-like sharp mouths to feed. They will throw mussels at rocks until they are shaken off. Egrets like to live in lakes, swamps and wet forests. Mainly eat small fish, mammals, reptiles, amphibians and crustaceans in shallow water.

Weighing less than 0.5 kg, it is small and light. According to research, the leg muscles of cranes account for about 22% of the weight, less than100g. The man doesn't mind that his legs are too thin, and he wants to chop off all the lean meat on his legs with a knife.

2. Mosquitoes scrape oil on the abdomen:

Mosquitoes are small and flexible. After being bitten by mosquitoes, we can't kill them whenever we want. This man can catch mosquitoes, not only that, but also cut open its abdomen. How can such a small mosquito cut open its own abdomen? Strong irony, the oil scraped is even more ironic, and no oil will be spared.

finally

These two sentences come from: Sanqu "Drunkenness leads to peace, laughter leads to small profits", "Grasping mud, grinding iron needles, scraping the face of the golden Buddha, searching carefully, making nothing out of nothing. Quails look for peas, egrets lick lean meat on their legs, and mosquitoes lick fat and oil in their stomachs. Thank you, old man! "

This is a highly exaggerated and satirical poem.