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The population of parrotlets they studied was located on one of the many huge hatos (cattle ranches) in the Venezuelan llanos, a vast swath of flat flooded savannah in the central third of the country that drains into the Rio Orinoco. You don’t really know a bird until you’ve studied it on its breeding grounds. The Auk 108: 863-871.
Not that long ago, Costa Rica had one of the highest deforestation rates in the world, rainforests were razed to make way for hot and chiggery cattle pasture, and bot flies probably became more numerous than some bird populations.
One of this species’ many peculiarities is that it has a digestive system unique amongst birds: Hoatzins use bacterial fermentation in the front part of the gut to break down the vegetable material they consume, much as cattle and other ruminants do. We found Black-collared Swallows breeding in cracks among the lower riverside rocks.
Although they breed on the west coast of Florida, Snowy Plover is a rare stray to this part of the state. Cattle Egret: 133. Orange-winged Parrot: 56. Shorebirds put on a good showing with a total of 18 species, despite the shrinking number and quality of sites offering adequate habitat. American White Pelican: 19.
The page-long entry on Geographic Variation offers descriptions of the five groups, in painstaking detail, differentiating subspecies of each group, articulating differences between males and females within each subspecies, drawing out winter and breeding ranges with the help of Lehman’s maps.
We immediately headed to an undisclosed location where Carlos had breeding Mangrove Cuckoos staked out. Sure, it was a lifer and an unexpected one because most of the hawks have moved further north to breed by late April but Carlos did nothing to ensure that it stuck around for better looks. We needed countable species!
A local cattle station out of town received 652mm in the same 24 hour period, so we got off lightly! The Little Egrets are beautifully white and you will note that one has started to get its breeding plumage. It means there are plenty of seeds for the local birds to feast on including the brightly coloured Red-winged Parrot.
Black-bellied Whistling-Ducks , Muscovy Ducks and Blue-winged Teals were around us, together with Green , Great and Little Blue Herons , Cattle and Great White Egrets , Black-crowned and Yellow-crowned Night-Herons , plus one locally rare Pinnated Bittern in the floating vegetation, as well as several dozen Neotropical Cormorants.
Quite often there are Australian Pelicans , Brolga and Royal Spoonbills present and the egret species often include Great Egret , Intermediate Egret , Little Egret and Cattle Egret. Although we have never observed Painted Snipe at this location, they were recorded breeding here in 1960 and 1961. Purple Swamphens. Black-necked Stork.
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