The oral argument of the day is an old one from the Ninth Circuit, Cetacean Community v. Bush, 386 F.3d 1169 (9th Cir. 2004). The case concerns whether Congress has the authority to grant animals standing to sue.
You can listen to the oral argument here:
One of the questions asked was how do animals give their consent for attorneys to represent them in court?
The Federal Circuit defers to the law of the regional circuits on matters of procedural law that do not implicate issues of patent law. Midwest Indus., Inc. v. Karavan Trailers, Inc., 175 F.3d 1356, 1359, 50 USPQ2d 1672, 1675 (Fed.Cir. 1999) (en banc in relevant part).