Interesting that you mention Wakodahatchee, I shoot their often. If I were to use a tripod there, I would not get about 90% of my shots. IMHO, the birds are so close and fly so fast that you will find that using a tripod prevents quick enough movement to get the shot. Also, a lot of folks use the elevated passage ways to walk, and if your tripod is not up against on of the hand rails you could find yourself blocking folks from going around you easily or worse, blocking a wheelchair.
Yes, I have also seen many folks with tripods with gimbal heads there, and I know they are missing a lot of shots. Besides, to move around you must either reset your legs, most people don't and they actually get in everyone elses way because they leave the legs extended.
I know you will make your own decision but if your shooting the 150-600 like MOST of us, including small folks, can get great shots without having to put it on a tripod.
Now if you were shooting say a 400 2.8, or a 500 or 600 f4, then you may well need a tripod. But with most lenses it is not necessary. Spend your money on quality glass instead.