This widespread South American Tyrannulet gave us a fit initially, with the crest down it just didn't look like a Southern Beardless. After a few minutes and great looks, it finally raised the crest and suddenly looked like a Southern Beardless!

This is one of 65 species of Tyrant Flycatchers we had on the trip, though a few of these were just heard birds, and all not seen by everyone. The list is:

Sooty-headed Tyrannulet (heard only)
Golden-faced Tyrannulet (heard only)
Venezuelan Tyrannulet (Venezuelan endemic)
Slender-footed Tyrannulet
White-lored Tyrannulet
Southern Beardless-Tyrannulet
Mouse-colored Tyrannulet (heard only)
Yellow-crowned Tyrannulet
Forest Elaenia
Yellow-crowned Elaenia
Great Eleania (pan-tepui endemic)
Yellow-bellied Elenia
Sierran Elaenia
Plain-crested Elaenia
Northern Scrub-Flycatcher
White-throated Tyrannulet
River Tyrannulet
Yellow Tyrannulet
UNNAMED WAGTAIL-TYRANT (Orincoco River island endemic)
Tawny-crowned Pygmy-Tyrant
Olive-striped Flycatcher
Ochre-bellied Flycatcher
Sierra de Lema Flycatcher (split from Mcconnell's Flycatcher; tepui endemic)
Slaty-capped Flycatcher
Black-fronted Tyrannulet (Venezulean tepui endemic)
Short-tailed Pygmy-Tyrant
Helmeted Pygmy-Tyrant
Pearly-vented Tody-Tyrant
Black-chested Tyrant (Orinoco river island specialist in Venezuela)
Ruddy Tody-Flycatcher (Venezuelan tepui endemic)
Slate-headed Tody-Flycatcher
Spotted Tody-Flycatcher
Common Tody-Flycatcher
Painted Tody-Flycatcher
Yellow-olive Flatbill
Zimmer's Flatbill
Gray-crowned Flatbill
Oche-lored Flatbill
Cinnamon Neopipo (heard only)
Ruddy-tailed Flycatcher
Cinnamon Flycatcher (heard only)
Smoke-colored Pewee
Fuscous Flycatcher
Cliff Flycatcher
Riverside Tyrant
Long-tailed Tyrant
Cattle Tyrant
Pied Water-Tyrant
White-headed Marsh-Tyrant
Grayish Mourner
Short-crested Flycatcher
Brown-crested Flycatcher
Great Kiskadee
Lesser Kidkadee
Boat-billed Flycatcher
Social Flycatcher
Rusty-margined Flycatcher
Yellow-throated Flycatcher
Streaked Flycatcher
Golden-crowned Flycatcher
Piratic Flycatcher
Variegated Flycatcher
Tropical Kingbird
Gray Kingbird
Fork-tailed Flycatcher