The timing for this trip has been tested and tweaked to optimize birding for specialty species in Texas so you can get wintering species like the spectacular Whooping Crane, and summer breeding birds like the Golden-cheeked Warbler and Black-capped Vireo. Early spring migration can add to the passerine list, especially if you get a light northern storm. The trip ends up in the Lower Rio Grande Valley to see the multitude of species whose only presence in the USA is in the deep south of Texas. The early spring date also has the advantage of beating the heat that comes in the following months, leading to very enjoyable temperatures even on the southern portion of the trip.