Feeling Sad

Do birds wonder why sometimes there is food in the  feeder and sometimes the feeder is empty?
Do they look for patterns, perhaps making a connection between snow on the ground and an empty feeder?
Do they ever wonder if something they did was responsible for food being withheld from them?
I cannot be sure but I suspect that none of the above is true. I suspect that birds come to our backyard , where they have found food before, and if they do not find it, they fly off to look elsewhere .
Human beings are meaning- makers , constantly trying to understand our world in terms of cause and effect. We desperately want to believe that the world makes sense, that it is a place where things do not just happen, they happen for a reason. Painful as it may be to conjure with , I had been feeling sad for some days now and my friends had been asking me why  I am feeling sad ? They could not understand , we can feel sad for no other reason than just the feeling we are experience ! May be we should learn from the birds to experience things in our lives without asking why ?