This is a daily question most accurate gets 50 to 100 points and gets on brain list what is the biggest organ of the humming bird

The heart

Explanation:

A hummingbird's heart is probably the biggest heart in the whole animal kingdom. A hummingbird's heart is very big compared to its weight

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.