Hello all new here but been raising tiels for many years. Just over a year ago we bought a new (what we were at the time told) male cockatiel. The seller was a very well reputed breeder and pet store seller (they breed their own birds). We were told this little fellow who we named sponge bob was a boy for certain however now I'm not so sure. Found him/her sitting in the water container making bp bp bp noises which I know can usually be called female mating behaviour. Up until now sponge bob has been a big personality, chirps and play fights with our other male, climbs everything in sight and face taps. He is now 17 months old and meant to be a cinnamon pearl. Below is some pictures of him as a tiny baby and some from now. He was always very undersized and we will love him as male or female regardless but I really am bugged to know. Any ideas? Picture with the lady is when he was little the other two are our little one now.