It is the only way I can explain their behaviour. When I walk out of the door to feed them there are frequently only one or two in sight. Within a minute there will be twenty or thirty begging for food. I will hear them calling out as they come in, so I am sure that they are communicating. They also seem to have very good eyesight.
Thanks for the speedy answer.
Could be...
Yes they do. Absolutely.
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