I suspect these two may be a mating pair with the reeds under their feet the possible nesting site, although this is supposition on my part. What I have read is the nest consists of pushed down reeds so this may be what is occurring in this series of photos. Only the bird on the left actually had mud around its face, the bird on the right had a clean face. There was interesting action going on between the birds. In the third photo the bird on the left was almost supplicating itself to the bird on the right, where as in the final photo the left-hand bird appeared to be giving the right-hand bird a nip with its beak. This happened several times while I was watching them, although there was no reaction from the right-hand bird. I did not know if it was some mating or coupling act, or was it an attempt by the left-hand bird to hold down its mate while the right-hand bird was trying to bend the reed over.