Flip Nicklin / Amazon River Dolphin (Inia geoffrensis) rescued from drying irrigation ditch off the Orinoco River, Lago De Prata, Brazil

Flip Nicklin / Amazon River Dolphin (Inia geoffrensis) rescued from drying irrigation ditch off the Orinoco River, Lago De Prata, Brazil

Emanuele Biggi / Ram cichlid (Mikrogeophagus ramirezi) male fish with iridescent scales guarding eggs . Captive, endemic to the Orinoco River basin in Venezuela and Colombia.

Emanuele Biggi / Ram cichlid (Mikrogeophagus ramirezi) male fish with iridescent scales guarding eggs . Captive, endemic to the Orinoco River basin in Venezuela and Colombia.

Tim Laman / Scarlet Ibis (Eudocimus ruber) foraging on the mudflats in the Orinoco River Delta, Venezuela.

Tim Laman / Little blue heron (Egretta caerulea) foraging at low tide in the Orinoco River Delta, Venezuela.

Tim Laman / Scarlet Ibis (Eudocimus ruber) flying among the mangrove trees in the Orinoco River Delta, Venezuela.

Tim Laman / Scarlet ibises (Eudocimus ruber) feeding at the low tide line on mudflats, Orinoco River Delta, Venezuela.

Tim Laman / Semipalmated plover (Charadrius semipalmatus) foraging at low tide on mudflats of the Orinoco River Delta, Venezuela.

Tim Laman / Semipalmated plover (Charadrius semipalmatus) foraging at low tideon mudflats of the Orinoco River Delta, Venezuela.

Tim Laman / Scarlet Ibises (Eudocimus ruber) flying onto the top of a mangrove tree in the Orinoco River Delta, Venezuela.

Christophe Courteau / Orinoco Crocodile (Crocodylus intermedius) female basking on the river bank, possibly to develop her eggs. El Cedral, Llanos, Venezuela. Critically endangered species.