Eurasian Penduline Tit
Remiz pendulinus
This is a small tit, 10–11.5 cm (3.9–4.5 in) in length with a finely pointed bill and a relatively long tail. The head is light grey with a black "mask" through the eye. The back is chestnut brown. The sexes are very similar in appearance, but the male has a broader mask and a more rufous back.
ID text from Wikipedia, CC BY-SA 4.0
Verdin
Auriparus flaviceps
The verdin is a very small bird. At 4.5 in (11 cm) in length, it rivals the American bushtit as one of the smallest passerines in North America. It is gray overall, and adults have a bright yellow head and rufous shoulder patch (the lesser coverts). Unlike the tits, it has a sharply pointed bill. Juveniles have a light gray body without the rufous shoulder patch and yellow head. The base of the short bill is thick by the head, and draws to a sharp point at the tip. Voice: Little is known about geographic or individual variation in vocalizations. Verdins produce a variety of calls, loud for their size. The typical call note is a repetitive "tschep" sound repeated in rapid staccato. In Texas, rapid "chip-chip-chip" calls have been observed, all at the same pitch and at the same speed in each call series.
ID text from Wikipedia, CC BY-SA 4.0
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