They are a pair. But which one is male and which is female? The bird on the right is not only more prominent, more active and it’s the one who brought its mate the food. I was surprised to know that she is the female.
It puzzled me how God created the male and female so differently. I guess it is a protection that they are the only ones who identify their mates. They are small, about 4 inches.
Here is another case. The turquoise-blue colored bird is a male bird, and he is named Green Honey Creeper, named after the female bird. I am guessing. The male bird was found and called before the female came around. I don’t blame the person who named and categorized the birds. There are just too many to be tracked.