Olive-backed Sunbirds at Bued River

I noticed a few days ago that these colorful little critters are frequently visiting some katuray trees (vegetable hummingbird tree, Sesbania grandiflora) along the Bued River, northern Philippines.

They use their elongated bills to sip nectar from the long, curved flowers. All I need to do was to wait patiently and motionlessly beside the trees, and they don't mind me being around as long as I keep myself outside their comfort distance, usually not nearer than 6 meters.

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Olive-backed Sunbird (Nectarinia jugularis, resident, male)

Habitat - Common lowland sunbird. 

Shooting Info - Bued River, Rosario, La Union, Philippines, June 18, 2020, EOS 5D MIII + EF 400 f/2.8 IS + EF 2x TC III,
800 mm, f/5.6, 1/1000 sec, ISO 320, manual exposure in available light, tripod/fluid head, near full frame resized to 800 x 533.

High-res 1800 x 1200 version