We have no idea why anyone would call the swan "androgynous" because this term generally pertains to a living being (plant or animal) which has both male and female genitalia or other gender specific characteristics. An androgynous creature is capable of producing offspring whether they are paired with another male or another female. This is not going to happen in swans. They are either going to be male or female.

In lieu of male/female bonding, male swans will pair with male swans and female swans will pair with female swans. Usually, this pairing occurs at a very young age which may be why the two boys have paired and are not interested in the female. There are also other possibilities:

1. The female is not interested in either swan and so they have chosen to pair up for this reason.

2. The female is too young/too old and they have decided to pair up for this reason.

3. No one knows the exact gender of the birds and what they think they are seeing or theorizing, may not be actuality.

Has anyone physically sexed the birds or had them genetically tested (DNA Sequencing), to determine which are males and which are females?

If not, there is no way for sure to determine the gender of the swans, just by looking at them from a distance until they have physically produced offspring. During nesting season, you will immediately know which is which, because eggs are laid by the females and obviously, impregnation begins with the male.

You may not be seeing eggs, nesting, etc., because the birds may not be old enough and they are still very young themselves. Again, you cannot know for sure unless the birds are properly sexed.

If the birds are indeed two males, they will mate and nest. No eggs will be produced. If the swans are two females, they will mate, nest and eggs will be produced, but the eggs will be infertile.

If the birds are male and female, they will mate and nest. Usually, eggs will be produced, but if there is a problem with the female, then eggs may not be produced. Also, just because eggs are produced, does not necessarily mean that they will be viable, (i.e., fertile), especially if there is something wrong with either or both swans. We hope this helps. The Regal Swan