Table 1 Description of the bird species used for the lens metabolomic analysis.

From: Nicotinamide adenine dinucleotide reduced (NADH) is a natural UV filter of certain bird lens

Bird species

Place of the sample collection

Number of individuals

Lens weight (mg)

Black kite (Milvus migrans)

Tyva Republic (July 2019)

5

90–158

Great crested grebe (Podiceps cristatus)

Tyva Republic (May 2019)

5

67–83

Little grebe (Podiceps ruficollis)

Tyva Republic (May 2019)

1

47.0

Horned grebe (Podiceps auritus)

Novosibirsk region (September 2019)

1

72.1

Red-necked grebe (Podiceps grisegena)

Novosibirsk region (September 2019)

1

42.9

Common buzzard (Buteo buteo)

Novosibirsk region (July 2019)

1

204.6

Grey heron (Ardea cinerea)

Novosibirsk region (September 2020)

1

350

Black-headed gull (Larus ridibundus)

Tyva Republic (May 2019)

7

62–99

Vega gull (Larus vegae)

Tyva Republic (May 2019)

3

135–153

European herring gull (Larus argentatus)

Tyva Republic (July 2019)

5

79–112

Great grey shrike (Lanius excubitor)

Novosibirsk region (August 2019)

1

47.6

Western marsh harrier (Circus aeruginosus)

Dagestan Republic (September 2021)

4

80–131

Rock dove (Columba livia)

Novosibirsk region (September 2017)

12

25–56