Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Orangutans spend up to ____ hours a day eating or foraging for food.
six

R is an average of the color rendering ability of ____ or more specific colors.
eight

Prairie voles look like rodents with small rounded bodies, ____ short legs and a short tail.

four