WARBLERS

Pine Warbler (Seen in The Woodlands, TX)

Our friend John Jones: "Looks like a Pine Warbler to me. It's a beautiful male. Note the slight streaking on the breast. The vireo doesn't have that.  Also, the bill is too long and sharp to be the yellow-throated vireo."

According to Peterson, "no other bright yellow-breasted warbler, lacking other conspicuous marks, has white wing-bars."  (The similarly colored vireo lacks this bird's two dingy breast streaks and has a thicker bill. Most other warblers have a streaked back.)
Yellow-rumped Warbler (Seen in The Woodlands, TX)
Non-breeding males, females and immature birds may have dingy colors --  BUT all have the yellow rump and yellow side patches year-round.
Wilson's Warbler

Almost always found near water, this tiny bird seldom ventures more than 10 ft. off the ground.  It often flicks its wings like a kinglet, and is a very active, cart-wheeling fly-catching warbler.

This is a male (black cap, rarely seen on a female, with contrasting yellow forehead). Note the yellow eyebrow, yellow under-parts, olive green upper-parts, no wing bars or tail spots.
Common Yellowthroat Warbler
Possibly the most common of all North American warblers, this bird likes marshes, grassy fields, and likes the lower trees, near the ground. The mask identifies this tiny fellow as a male. He's olive green above; yellow below. Note the yellow breast and lack of wingbars.
Orange-crowned Warbler
Most warblers migrate into South America, the orange-crowned warbler stays in the southern states, southern Texas, and Mexico. (We found this little fellow near the Rio Grande.)

Olive-green above, paler yellowish-green below, and the plainest of all our warblers, the orange-crowned warbler lacks the wing-bars and facial patterns. Even the orange crown is hidden by greenish feather tips.