The hay is sufficient for 2 guinea pigs for about 4 days. Fantastic thing! The distances between the branches are very large for young guinea pigs, so that our young first sat at a time between the branches in the hay. That's why we still attached to these places a thin strip of wood, so the juveniles through the crawl through can not squeezing. Now the guinea pig are so large that they can climb on the hay up (when the roof is down). 4 stars because it's a great house. Wg. The spaces between the branches 1 point deduction