There are at least three bird varieties with nests in my yard (that I am aware of)
A dove is in my front hanging basket
There is a bluejay in a tree in the backyard

And there used to be a robin's nest with three babies
Today I found all three on the ground, one appeared to have teeth marks (could have happened afterwards)

You are looking up into a tree at a disconsolate mama robin
She just hops from limb to limb making that quiet warning cheeping aound
But there are no baby birds to hear her

In the inset is her overturned nest (the camera is looking up in to the tree)
All of the contents could be found where they hit the ground
I don't know if the nest had help falling or if it just was perched too precariously on the branch

I hope they build again