Who Is that Stranger?

Just now I had a big fright! I explored the room as usual and wanted to play with a pen on the floor. When I got closer, suddenly there were two pens... but what was more, suddenly there was another bird in the room! All my feathers suddenly stood on end as I put them all up to show who is boss around here... and at exactly that very moment so did that bird! I stared it in the eyes and loudly growled like a dog, but it didn't dare to growl back. The family laughed and laughed, but I don't think there was anything funny, was there? Quite upset I walked away, but fortunately, when I looked back, the strange bird didn't follow me. It was all very, very peculiar.