All these photos were taken with the Nikon AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR AND also with the AF-S TELECONVERTER TC-14E III attached to the lens as well.
You may notice that some photos are at ranges of 750 and 800 mm. Those used both the internal and an external TC at the same time. There were a few shots where the birds were closer that had the internal TC switched off. Those had shorter ranges like 350mm.