I have bags and bags full of makeup that i don't even use!  
Hoarding is a behavior where people or animals accumulate food or items
Yes, and I have this behavior!  I can't seem to party with any of the makeup.  Some of it is about 5 years old!
Hoarding is a common behavior in many birds species 
Yes, but I'm not a bird. I'm a human. 
lol. Most animals caches are of food
Well, I do love to hide potato chips from my husband. Does that count?
) One theory suggests that human hoarding may be related to animal hoarding behavior, but substantial evidence is lacking.
Human hoarding.
Civil unrest or threat of natural disaster may lead people to hoard foodstuffs, water, gasoline and other essentials that they believe, rightly or wrongly, will soon be in short supply. Survivalists, also known as preppers, often stockpile large supplies of these items in anticipation of a large-scale disaster event.
Human hoarding Anxiety disorder and hoarding.
Individuals who meet diagnostic criteria for hoarding
Hoarding
Hoarding is a behavior where people or animals accumulate food or other items.
Animal behavior.
"Hoarding" and "caching" are common behaviors in many bird species as well as in rodents. Most animal caches are of food. However, some birds will also stingily collect other items, especially if the birds are pets. Magpies are infamous for hoarding items such as money and jewelry. (Contrary to popular belief, research suggests magpies are no more attracted to shiny things than other kinds of items.