I also heard a Common Nighthawk call several times. The local Northern Mockingbird was not mimicking a Common Nighthawk. This was probably a migrant Common Nighthawk moving through the area. As I was about to leave the area, a kingbird showed up at the tennis court. It landed on a light and gave a twittering "pip-pip-pip-pip" call of Tropical Kingbird, unlike the local Couch's Kingbirds. I stayed for a while to study the Tropical Kingbird. I was able to find a pair on Viking Lane near Oliveira Park and got a few photographs, which show the notched tail, the darker face patch and the longer thinner bill than for Couch's Kingbird shown in the next photo. At close range the tips of the primaries for Tropical Kingbird are unevenly spaced for adults, which can be seen on this photo. Note the thicker bill to the tip for Couch's Kingbird
(second photo) and the less distinctive face patch. Despite these details in photos examined in close-up, this Couch's Kingbird was identified by the shrill rolling "breeeer" calls.
After Oliveira Park, I headed to Old Port Isabel Road to look for Cassin's and Botteri's Sparrows and maybe an Aplomado Falcon. It was a bit of an adventure to get to the eastern good birding part of Old Port Isabel Road. There is a new bridge over FM-511, which is still closed. To get to Old Port Isabel Road east of FM-511 coming from the west, I had to go south on FM-511 and then go north to make a right turn onto Old Port Isabel Road. I added quite a few birds on Old Port Isabel Road--Cassin's Sparrow, Cactus Wren, Verdin, Whimbrel, Chihuahuan
Raven, Lark Sparrow, Curve-billed Thrasher (by the two noted whistled call), Vesper Sparrow, and White-tailed Hawk. I also found a migrant Magnolia Warbler, gray winged with white wing bars, yellow under-parts with dark streaking on the side. I was able to get a photograph of the Chihuahuan Raven showing the key identification field mark, the white bases to the feathers on the neck, the reason why this bird once was named White-necked Raven. See photo. I was also able to photograph a Cassin's Sparrow (last photo) singing from a perch using my car as a blind and lowering the passenger side window. More often Cassin's Sparrows sing
This was a very productive day, adding twenty four species. I added Red-crowned Parrot, Tropical Kingbird, Common Nighthawk, Magnolia Warbler, Cassin's Sparrow, Cactus Wren, Verdin, Lark Sparrow, Whimbrel, Chihuahuan Raven, Curve-billed Thrasher, White-tailed Hawk, Vesper Sparrow, Snowy Plover, Northern Parula, Fulvous Whistling-Duck, Stilt Sandpiper, Solitary Sandpiper, Pauraque, Yellow-crowned Night-Heron, Spotted Sandpiper, Cerulean Warbler, Buff-breasted Sandpiper and White-faced Ibis. The total list is finally now over 300 at 315!