Bee Hummingbird: The Bee Hummingbird is the smallest bird in the world, measuring around 2.2 inches (5.5 cm) long and weighing about 0.06 ounces (1.8 grams).
Weebill: Weighing only around 0.2 ounces (6 grams), the Weebill is a tiny bird found in Australia, measuring approximately 3.5 inches (9 cm) in length.
Elf Owl: The Elf Owl is one of the smallest owls, with a length of about 5-6 inches (13-15 cm) and a weight of around 1.4 ounces (40 grams).
Goldcrest: The Goldcrest is a Eurasian bird that measures around 3.5 inches (9 cm) in length. It is known for its distinctive golden crest on its head.
Verdin: The Verdin is a small bird found in the southwestern United States and Mexico. It measures about 4.5 inches (11.5 cm) long and weighs around 0.3 ounces (8 grams).
Firecrest: Similar in size to the Goldcrest, the Firecrest is a European bird known for its vibrant orange and yellow plumage.
Least Pygmy-Owl: This tiny owl species, found in Central and South America, measures approximately 5 inches (13 cm) in length and weighs about 1.6 ounces (45 grams).
Black-Capped Chickadee: The Black-Capped Chickadee is a small bird native to North America. It measures around 5 inches (13 cm) in length and weighs about 0.4-0.6 ounces (12-16 grams).
Ruby-Throated Hummingbird: The Ruby-Throated Hummingbird is a well-known hummingbird species in North America. It measures about 3-4 inches (7.5-10 cm) long and weighs around 0.1-0.2 ounces (2.8-5.5 grams).
Pygmy Nuthatch: The Pygmy Nuthatch is a tiny bird found in North America, measuring about 4 inches (10 cm) long and weighing approximately 0.4 ounces (12 grams).