regurgitation while traveling in car

Question
my 9 month old male catalina macaw will regurgitate after head bobbing when ever i try to take it for a car ride. it is fresh food in big chunks and fresh smelling, but he doesn't look happy, he looks worried. he loves riding in the golf cart even on rough terrain.what should i do. i will be moving to another state and he needs to be able to travel

Answer
One of my best rescues that was adopted out after a year in my care was a Catalina male that I hand fed for a month when he first came here.  They are remarkable, sweet and gentle macaws.

Your boy is feeling insecure or as you have noted, "he looks worried".  A macaw person can accurately tell what they're thinking or feeling like this, so I give you plenty of credit for that. Some extra soothing has often made the difference with ours.  It's gotten to the point where the two permanent in house residents (two female macaws) look forward to car rides because we gave them something happy to associate with it.
  I don't know how you've been transporting him, but we put an adjustable shower curtain rod across the back seat and lay an old shower curtain underneath.  It's not the safest mode of transport given that if there's ever an accident it could be dangerous, but one of those back seat pet dividers people use for dogs.  

 Using a shower curtain rod that has grooves in it rather than smooth has more of a grip, or wrapping  a few areas with duct tape that you let wrinkle for grip can be done.

 After a short, few minute trip, make your destination someplace that you can get out of the car together.  I'd take the girls to a local ice cream shop that was friendly and as we sat outside visiting with people (great socializing exercise for them) the owner would bring the girls a sample cup of no sugar added, frozen yogurt to share.   

 These days they don't care if we stop or not, riding in the car is a pleasant experience for them.

For longer trips you need to get him used to carrier travel.  A large dog kennel with a low perch installed if he prefers or a soft blanket which is often appareciated.

 When it comes to the regurgitation, it's self-soothing.  Just gently reassure him and turn away from him when he starts this.  I tell them "no need for that" and turn my back (a bird cannot stand to be shunned). It lessens the occurence.

  See my girls and more about bird care
 www.4AnimalCare.org (click the bird tab)