Ranitidine is a competitive, reversible inhibitor of the action of histamine at the histamine H2-receptors, including receptors on the gastric cells. Ranitidine does not lower serum Ca++ in hypercalcemic states. Ranitidine is not an anticholinergic agent.
1 The Blue Marlins have a diet of: Octopi, squid and pelagic fish such as black fin tuna and frigate mackerel.  They do prefer to hunt alone and during the day, rather than in schools, so it is safe to say they are a rather antisocial species.
Quick Answer. Blue herons are carnivores that eat a variety of aquatic and land prey, including fish, frogs, turtles, young birds, bird eggs, snakes, insects, mice, moles, gophers and other small mammals. While they live in colonies, herons typically hunt alone and up to three miles from their pack.