Acacia smallii. Or possibly a White-thorn acacia. Growing at the edge of a back yard. The spines occur singly, unlike the paired spines of the White-thorn acacia, which has paired spines. At least, I think so, I’ll have to have another look.
Saw two Abert’s Towhees chasing each other through the trees, and a pair of Brown-headed Cowbirds, the female a dull brown, making a rapid chirping trill, and the male dark and glossy, making a strange liquid sound. Also, a couple of days ago, a Wilson’s Warbler and a Black-capped Gnatcatcher.