How are tinamous similar to partridges and quail?

Tinamous are often compared to partridges and quail because they share a similar superficial appearance and are both ground-dwelling birds.1

While they resemble these Galliformes (chickenlike birds) in their general body proportions and terrestrial lifestyle, they are distinct in several ways:

• Flight: Unlike partridges and quail, tinamous have limited flight capability and prefer to run or walk.1
• Foraging: Tinamous do not scratch the ground for food as gallinaceous birds do; instead, they use their bills to dig or turn over debris.1
• Roosting: Most tinamous sleep on the ground at night, whereas chickenlike birds typically do not.1

Historically, the similarity in appearance was significant enough that frozen tinamous imported from Argentina were once sold in the United States under the name "South American quail".1