Looks can be deceptive.

Looks can be deceptive. Take this little chap.

He (let’s assume it’s a male)* looks so cute. His song fills my garden with such a sweet sound it fills my heart with joy. 

In actual fact he is an awful bully. Today I had a couple of visitors who I hadn’t manged to spot before, I now know why. Mr. Robin attacked them as they tried to feed!

This one just about managed to get a quick beakful before the robin pecked her (let’s assume it’s a female)*. Her friend was acting as decoy at the time. 

*If a passing reader is able to sex my birds I will happily correct my text.