Re: do animals pray?
Many consider prayer to be a communion with God, not an exercise in glorification. Prayer can be the sharing of thoughts and emotions with God, asking for guidance, absorbing/basking in His love and presence. I don't think animals have the communication/awareness to do this kind of thing. And unless you believe animals have souls it is unlikely they are praying or required to pray.
But if someone interpretes prayer as glorifying God and in the sense that animals are doing what God intended them to do indicates they are glorifying God - birds singing, fish swimming, bears $hitting in the woods, then I guess one can stretch it to say that animals are praying.