natural habitok said:

Fun fact: cuckoo birds are capable of mimicking the cries of a sparrowhawk to scare away or intimidate nearby birds.

Which sometimes attracts the attention of an actual sparrowhawk, who then proceeds to kill the rival "sparrowhawk" for intruding on its territory.

Alanis, killed by a sparrowhawk

Aww, it's so nice to see Robert actually being a good big brother!

The weasel kid's still alive!