It seems to me that cats don't pose much of a risk and that they are a little bit after the impossible. How can you tell the sex of birds? I think by their beaks, but I never know.
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They can get to the nest if they find it and eat the chicks. Happened before.
How can you tell the sex of birds?
The blackbird female is more brown with daker beak, like on the photos. The male is all black with more yellow beak.