Birds Active during the day

Yellow-olive Flatbill

Tolmomyias sulphurescens

iNaturalist eBird Wikipedia

A master of the mid-canopy, the Yellow-olive Flatbill is a charming Neotropical specialist known for its distinctive 'spectacles' and expert fly-catching abilities. Distributed from Mexico to Argentina, it is a vibrant addition to any tropical backyard birding list.

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Quick Identification

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Size

13-14.5 cm (5.1-5.7 in) in length; weighs approximately 13-17.5 g (0.46-0.62 oz)

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Colors

Olive-green upperparts, bright yellow to sulfur-yellow belly, grayish throat, and dusky wings with two yellowish-white wing bars.

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Key Features

Broad and distinctly flattened bill with a pale lower mandible
Pale yellow or whitish 'spectacles' and eye-ring
Two prominent yellowish wing bars
Relatively large head for its body size

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 6-10 AM, 3-5 PM

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Season Year-round

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Diet Primarily insectivorous, feeding on beetles, caterpillars, flies, and small wasps. They occasionally supplement their diet with small berries or fruits.

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Habitat Found in forest edges, secondary growth, humid lowland forests, and well-wooded suburban gardens or parks.

Behavior

The Yellow-olive Flatbill is an active and somewhat inconspicuous resident of the mid-canopy. It is a classic 'sit-and-wait' predator, often seen perching upright on slender branches while scanning for insect prey. Once an insect is spotted, the bird performs a quick, acrobatic sally, snatching the prey from the air or gleaning it from the underside of a leaf with a loud snap of its bill.

While they are primarily solitary or found in pairs, these birds are frequent participants in mixed-species foraging flocks, moving through the forest alongside tanagers and woodcreepers. They are more often heard than seen; their vocalizations consist of sharp, buzzy, or wheezy notes that carry well through dense foliage. Unlike some flycatchers that migrate long distances, the Flatbill is a year-round resident across most of its vast range.

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Camera Tips

To successfully capture a Yellow-olive Flatbill on your backyard camera, placement is everything. Since these birds rarely descend to the ground, mount your camera at a height of 8 to 15 feet, aiming it toward horizontal 'perching branches' near the edge of a wooded area. They are attracted to open pockets within the foliage where they have room to maneuver during their hunting sallies.

Because they are insect-eaters, standard birdseed won't work as a lure. Instead, focus your camera on a high-mounted water source. A birdbath with a solar-powered dripper or a mister is highly effective, as the sound and movement of water will draw them down from the canopy for a drink or a bath. Position the camera to face north or south to avoid lens flare during the early morning hours when they are most active.

Adjust your camera settings for a fast trigger speed and high-resolution video. These birds move quickly and their 'sally' happens in a fraction of a second. If your camera has a 'Pre-Roll' feature, enable it so you don't miss the moment they launch from their perch. Since they live in dappled light environments, use a camera with good dynamic range to ensure the bright yellow of their belly isn't 'blown out' by the sun while their olive back remains visible in the shade.

Similar Species

Species that look similar or are commonly confused with Yellow-olive Flatbill.

Yellow-breasted Flycatcher

Has a more uniform yellow breast and a narrower, more standard-shaped bill compared to the flatbill.

Gray-crowned Flatbill

Features a distinct gray cap that contrasts with its olive back, whereas the Yellow-olive's head is mostly olive.

Yellow-margined Flatbill

Virtually identical in appearance but often has a darker iris and a more rhythmic, multi-note song.

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Frequently Asked Questions

Yellow-olive Flatbills are most active during the early morning hours, typically from 30 minutes after sunrise until mid-morning. They have another burst of activity in the late afternoon before dusk.

The best way to attract Yellow-olive Flatbills is to maintain mature native trees and avoid pesticides to ensure a healthy insect population. Adding a water feature with a dripper or mister is the most effective way to encourage them to visit.

They are primarily insectivores, eating a wide variety of small invertebrates like beetles, flies, and caterpillars. They catch most of their food mid-air or by snatching it off leaves.

Yes, they are quite adaptable and frequently inhabit suburban gardens and parks, provided there is enough tree cover and a lack of heavy chemical intervention in the landscape.

Focus on the bill; it is noticeably broader and flatter than most other small flycatchers. Also, look for the pale 'spectacles' around the eye and their unique buzzing vocalization.

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