I have just seen this article and I'm going to reply to the last person's comment about whether animals can "sin." Before I begin, let me be honest in saying that I haven't done a considerable amount of study and most of this will simply be stuff that comes to mind immediately.
1st, Examples of animals that acted wilfully:
Baalam's Donkey: Here the donkey, in a act of self-preservation, as much as preservation of its master, saw the angel and prevented Baalam from moving forward. The passage does not seem to suggest that GOD made the donkey stop, but that the donkey possesed the knowledge that further movement, not in accordance with GOD's will, would bring severe consequences.
The Serpent (Possibly?): I mention this because I do not see any indication that the serpent was forcefully made to serve Satan's ends, and in fact, GOD spoke punishment on the serpent (that he should go about on his belly and eat the dust of the earth), as well as Satan, when laying out the consequences for having taken part in the fall.
2nd, Animals that acted contrary to their nature (as we know it), under GOD's control:
The Ark: I don't remember if this is actually set out, but I believe the animals came to Noah, he did not have to go looking for them. GOD divinely caused the animals to come to Noah, to board a ship, and to otherwise not hinder Noah in his seeking of GOD's will.
The Lowing Cattle: When the Philistines realized that the taking of the Ark of the Covenant was bringing the much grief in the form of plagues from GOD, they purposed to return the Ark to Israel. To determine that it was actually GOD who had brought the plagues, they took cows and separated them from their newbord calves, hitched them to a wagon carrying the ark, and let them walk under their own power and direction. The cattle desired to return to their calves (as shown by their lowing), but under GOD's divine power and direction were led back to Israel.
The Fish (Leviathan?): GOD used this marine animal to bring a message of repentance to the sinner's of Nineveh in the person of Jonah, as well as to show Jonah that HE was in control of the Earth and that when HE had indicated HIS will in a matter, He would not be satisfied til it was accomplished.
3rd, Examples of GOD's use of creatures acting out naturally (as we know it) to do supernatural things. (Most numerous)
1st, The plagues. Locusts, Frogs, Gnats all these were animals who acted in GOD's will to supernaturally plague the Egyptians, but their actions were not contrary to their own natural state of action, i.e. the locusts ate the crops as they usually would etc.
2nd, The birds for meat. GOD fed his people meat during their journey to the promised land by providing this flock of birds. While their actions seem kind-of unnatural, I still place this here because birds flocking is not abnormal.
3rd, Biting serpents. GOD punished HIS people for disobedience by sending the biting serpents to plague them. This also gave an opportunity to show HIS diving providence by providing an opportunity for redemption.
4th, The Hornet. While this might be a figure of speech for GOD's power prior to battle, often times the Bible mentions that GOD sent the hornet before the Isrealites to confuse and hinder their enemy. It is obvious that an army stricken by an outrageous number of hornet stings would be a particularly ineffective army, therefore, I believe GOD really did use these creatures supernaturally to cause disruption and bring victory.
As far as sin, GOD does seem to judge animals along with their human counterparts (consider that GOD told the Israelites to destroy ALL of the life from particularly evil people, the Amelikites come to mind, this included the animals which dwelt with these people.) To me this indicates that they "shared" in the sins of their masters in the same way the Earth has "shared" in the sin of Adam and were therefore due the wrath of a HOLY GOD, However, if animals can come against GOD and HIS will, then they can also follow it, both willfully and against their will, therefore I say they can, if not willfully, at least share in sin and judgment, or share in obedience and Glory!!