Two different diving species in an abstract style but contrasting in many points:

Systematically: grebe vs. diver

Habitat: lake vs. sea

Image Colour: light vs. dark

Great crested Grebe | Haubentaucher | Podiceps cristatus - Friesland, North Germany. 13 August 2021

Canon EOS R5 |  Canon EF 400 mm f 5.6 L USM |  1/5 |  f 22  |  ISO 100 | intentional camera movement

Red-thorated Diver | Sterntaucher | Gavia stellata - Helgoland, Germany. 16 October 2021

Canon EOS R5 |  Canon RF 100-500mm f 4.5-7.1 L  | 500 mm |  0.6 sec |  f 51  |  ISO 50 | intentional camera movement