Predator

The circle of life in a Scottish graveyard: 

European robin vs. earthworm 

Oriole nest

Mommy bird visiting

Three babies!

Seaside brunch for two

This gull was attempting, with little success, to break the shell of a still-squirming lobster: 

Then it began squawking (what looked and sounded like  a pair bonding call), attracting the attention of another gull. They bobbed their heads and squeaked at each other (as in the linked video), and then the newly arrived one began to attack the lobster:  

 And finally cracked the shell!

Aggressive hummingbirds

A couple of male Anna's Hummingbirds that were loudly chirping and occasionally getting up to chase each other:

The rival, probably a molting juvenile

Dolphins and pelicans