Cassowaries are the world's most dangerous birds because they are large, flightless, and live in Australia. Have deadly feet and claws. Endangered.
According to UK press reports Seagull attacks leave a Brighton woman bloodied, and a dive-bombing forces a Bodmin vicar to wear a hard hat to church.
Golden eagles can carry up to 2kg and have been known to drop tortoises to break the shell. Aeschylus was allegedly killed by one, and the Kyrgyz of Mongolia use them to hunt wolves.
Pelicans will eat whole pigeons, fish, gulls, ducks, cormorants, terns, and even penguins. Visitors to St James' Park were stunned as one pelican devoured a pigeon.
The ostrich, the world's largest bird, can outrun humans (30 mph) and kick with powerful legs. It has been responsible for the deaths of humans, hyenas, and lions.
Shrikes use a dive to stun birds, then bite their vertebrae and fly away with them, impaling them on thorns or barbed wire or hanging them from tree branches.
Vultures feed on rotting carcasses, with the exception of black vultures, which chase away turkey vultures. They also peck out the eyes of newborn calves.
Cuckoos lay their eggs in the nests of other birds, tricking them into raising their young. The baby will grow in size, make a loud begging call, and resemble the host chicks, tricking the host into feeding it.