Here are links to a few videos and a couple of blog posts on identifying millets by their grains (hulled and unhulled) and by the appearance of the plants. These vary in quality and the selection of millets shown, but can help one get an idea of how to distinguish among the various species.

IDENTIFYING (DE)HULLED MILLETS

"How to Differentiate Dehulled MIllets," Tapas Chandra Roy, 9 August 2020 (5:37)

(Our friend Tapas Chandra Roy shows how to identify 5 of the small millets: foxtail millet; proso millet; kodo millet; barnyard millet; and little millet. These are somewhat similar, but there are differences in color, size, and to a degree shape and other characteristics.)

"How to Identify each of the Small Millets/Siridhanya & understand if its Polished or not," SaveraGirs- SustainableHealthSolutions, 3 February 2021 (4:09)

(After a brief discussion of the importance of millets, 5 small millets are shown and compared: Foxtail millet; barnyard millet; browntop millet; kodo millet; and little millet.)

IDENTIFYING UNHULLED MILLETS

"Millet Grains based on Shape,Size,Colour (Browntop, Kodo, Barnyard, Little, Ragi, Foxtail, Pearl, Sorghum)," Tapas Chandra Roy, 15 June 2019 (3:57)

(Tapas, in an earlier video, shows the grains of 8 millets - the 5 small or "minor" millets with their hulls, plus pearl millet, sorghum, and finger millet, whose seed coatings do not have to be removed - and describes their sizes and shapes. For text, see https://tcrconnectingagriculture.com/2020/03/millets-grains-based-on-shape-size-and-colour/ )

"9 Millet Grain Identification in a better way," The Millet Advisor, ~2020 (blog article)

"Seed identification of cereals and millets," Agristar G, 7 September 2020 (1:45)

(A very quick tour of seeds and grain heads not limited to millets. I include it as some of the pictures are quite clear. Shown are: wheat; rice [O. sativa]; corn/maize; barley; oats; rye; triticale; sorghum; pearl millet; finger millet [ragi]; foxtail millet; kodo millet; little millet; barnyard millet [Echinochloa frumenracea]; browntop millet; quinoa; teff; and fonio, Seeds are unhulled.)

IDENTIFYING MILLETS FOR NON-FOOD USES

"Different millets in cover crops," OSU Plant and Soil Sciences - Extension and Teaching, 31 March 2023 (3:52)

(Beatrix Haggard, PhD, Assoc. Prof., Oklahoma State University Plant & Soil Science discusses identifying characteristics of the stalks & heads of: sorghum, along with Sudan grass & crosses; foxtail millet; Japanese millet, and the barnyard group; and browntop millet.)

"Understanding Different Millet Species | German Millet, Proso Millet, Japanese Millet," Justin Fruechte, Millborn Seeds / Renovo Seed, 12 September 2019 (4:01)

(Views in the field with explanations of three millets for forage. German millet of course is a variety of foxtail millet [Setaria italica] and Japanese is also known as Japanese barnyard millet [Echinochloa esculentus].)