I heard some strange ticking noises coming from inside of the hive, today. It was not a/the queen making piping noises. It was an irregular, more ticking kind of noise. As if something was hitting one of the metal parts the hives (screen underneath or the queen excluder). I did not record the sound, but found something similar uploaded by another beekeeper, here: https://www.dropbox.com/s/ub7h8wforpy98fl/bee%20knocking%20noise.wav
I checked the screen underneath the hive (I read that sometime bees bump into the screen) but to my idea it did not come from there. I noticed the bees outside the hive seemed agitated. This was before I heard the ticking noise (it could not be heard all the time).
And at the end of the day I found some 25 bees on the ground (well, on the B2 blocks that form the ground) in front of the hive and some 60 bees underneath the hive. Since it has been quite cold the last couple of nights, I collected the very passive bees, took them in the house where they warmed up and started being active again, and took them back into the hive.
I did not open the hive, because it was not warm enough, but it sounded like something was inside the hive, and agitated the bees. I’ve only had this hive for about 3 weeks now, but have never seen so many bees outside the hive at the end of the day (sure to die during the cold night). So, I’m really curious to know what caused the ticking sound and why.
Any ideas? (Additional info: I have a mouse excluder at the entrance of the beehive, nothing big can enter the hive).