a Common Grackle is one
The bird with blue wing feathers in Greece is called a Blue Winged Teal. It has cinnamon brown body feathers and patterned black marks on it.
The bird you are referring to could be a male Orchard Oriole. It has a bright yellow body with a black chest and wings, and its bill is also black. The Orchard Oriole is similar in size to a Blue Jay.
The Steller's jay, the western relative of the blue jay.
Blue bird
Common Grackles have iridescent heads that often look blue in the right light, and their bodies are a sort of brownish, iridescent black.
The bird you are describing is likely the Western Meadowlark. It is known for its bright yellow head and body, black wingtips, and is slightly larger than a blue jay. It is a common bird found in grasslands and prairies across Oklahoma.
Red head and black body bird
The bird you are referring to is a Grackle. The female has the yellow eyes.
The small bird you’re describing is likely the Eastern Bluebird. It features bright blue wings and a rusty orange to brown chest, while its head and back are a darker blackish-blue. However, if you are thinking of a bird with a more prominent black body, you might be referring to the Common Grackle or the Red-winged Blackbird, which can sometimes display iridescent blue in their wings. Each of these birds has distinct features that make them unique.
The bird you are describing sounds like a male Eurasian Blue Tit (Cyanistes caeruleus). It features a vibrant blue body, a brownish head, and distinctive black markings around its eyes. These small, colorful birds are commonly found in Europe and are known for their playful behavior and acrobatic feeding habits.
The small bird with a black head and white body is called a pied wagtail.