Animals and humans, who too are animals, share many similarities in anatomy, including a heart which pumps blood to the various organs of the body. Every animal requires blood pumped through their veins, but not all animal hearts beat to the same rhythm. Just a glance at particular animal skeletons reveals how different animal anatomies are from each other. Larger creatures, like cows and whales, require greater heart chambers to get that blood flowing from head to tail, which, in the case of a whale, can be upwards of 50 feet. But tiny animals, like ducks and chickens, sport much smaller organs because their loads are simply that much lighter.
These animal heart photos illustrate how the most important organ in the human body looks for different species. Up closely, noticeable differences between human hearts and animal hearts become more apparent. But from far away, most pictures of animal hearts look no different than the heart nestled in your own chest right now.