What color is earthworm blood? You'll know after reading this

Earthworm blood is rose red. The earthworm is a common terrestrial annelid that lives in soil, hiding by day and emerging at night. It feeds on livestock and poultry manure and organic waste, swallowing it together with soil, and also consumes fragments of plant stems and leaves. Earthworms can loosen the soil, improve the soil, increase fertility, and boost agricultural yields.

The blood of any animal is composed of plasma and blood cells. The color of blood is determined by the chromoproteins present in the plasma or blood cells. Different chromoproteins have different colors. A chromoprotein containing copper, called hemocyanin, makes blood blue or cyan; a chromoprotein containing vanadium, called chlorocruorin, makes blood green; and a chromoprotein containing iron, called hemoglobin, makes blood red. Earthworm blood is rose red, the blood of prawns and river crabs is pale cyan, the blood of horseshoe crabs is blue, the blood of freshwater mussels is pale blue, the blood of squid is green, and the blood of vertebrates, including fish, amphibians, reptiles, birds, mammals, and even humans, is red.

Earthworms generally remain in the surface layer of soil, but during dry weather or in winter they can burrow as deep as 2 meters (7 feet). One Asian species can climb trees after heavy rain to avoid drowning. Earthworms are food for many birds and beasts and indirectly provide food for humans. They loosen the soil, which helps aeration and drainage, and drag organic matter into the burrows they dig, accelerating decomposition, thereby increasing the nutrients plants need for growth. Earthworms can also be used as fish bait, so they are commonly known as fishing worms.