Perhaps it's the skill and care shown in the painting of each individual owl, not painted to represent a breed of owl but more the owlish imagination of the artists.
Have a close look at each one and you will see what I mean.
Considering their age and where they came from let's all hope tiny fingers did not complete the tiny details on these perfect owls.
Over to aBay for some AI info......

Add a touch of vintage charm to your collection with this quartet of hand-painted ceramic owls. Made in China, these unmounted ornaments/figurines showcase exquisite craftsmanship and attention to detail. With the bird type being an owl, this set is perfect for bird and animal collectables enthusiasts. Crafted from high-quality ceramic/pottery material, these adorable owls will look great on display in any room of your house. The country/region of manufacture is China, making this set a unique addition to your collection. Don't miss the opportunity to own these stunning pieces!