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Black-necked grebe or eared grebe (Le cổ đen, Podiceps nigricollis)

The black-necked grebe or eared grebe (Podiceps nigricollis) is a member of the grebe family of water birds.
The bird is found Europe, Asia, eastern and southern Africa, interior southwestern Canada, and the southwest and western United States.
This species is migratory.

Podicipediformes, Podicipedidae: Latin podex, podicis vent, rear-end; pes foot; podicus of the foot (pes, pedis foot). The name means foot at the rear-end, describing position of the legs.

The genus name Podiceps comes from Latin podicis, "rear-end" and ped, "foot", and is a reference to the placement of a grebe's legs towards the rear of its body.

Nigricollis is a New Latin scientific term derived from Latin, meaning "black-necked". It is formed from niger ("black") and collis ("neck").

Great crested grebe 
(Podiceps cristatus, Chim lặn mào lớn)

The great crested grebe (Podiceps cristatus) is a member of the grebe family of water birds.
The bird is found across Europe and east across the Palearctic. Those populations in cold regions are migratory while those in milder climate are resident.
The great crested grebe was first recorded in Vietnam on the Ba Lat River in the Xuan Thuy National Park in Nam Dinh Province in January 2026.

Podicipediformes, Podicipedidae: Latin podex, podicis vent, rear-end; pes foot; podicus of the foot (pes, pedis foot). The name means foot at the rear-end, describing position of the legs.

The genus name Podiceps comes from Latin pōdicis (genitive of pōdex), meaning "rump" or "anus," and pēs, meaning "foot". This refers to the grebe's legs being positioned far back on the body.

The specific name, cristatus is a Latin adjective (from crista), meaning "crested".

Podiceps is a genus of birds in the grebe family. 

1/ Black-necked grebe or eared grebe (Le cổ đen, Podiceps nigricollis)

Podicipediformes, Podicipedidae: Latin podex, podicis vent, rear-end; pes foot; podicus of the foot (pes, pedis foot). The name means foot at the rear-end, describing position of the legs.
The genus name Podiceps comes from Latin podicis, "rear-end" and ped, "foot", and is a reference to the placement of a grebe's legs towards the rear of its body.