You grew up loving animals around you, and despite researching the wildlife in general, you have a specific type of animal you have a particular knowledge in and understand above all else. Choose or randomly determine the animal that you are most knowledgeable in.

Since you've spent years upon years of research and being around animals and creatures alike, you have a natural way with them. You have advantage on Animal Handling skill checks on common wild animals, tamed animals and your animal of specialization choice when trying to calm them or approach them. You have a specialty in being able to tame creatures and understand how they learn. You can learn about any animal provided you are able to follow them and watch them for about a week and once you learn about an animal, you have advantage on Wisdom checks to approach them and Intelligence checks that allow you to recall information about them.

You have spent your entire life studying dragons and learning about them. You've seen the good, you've seen the bad and you understand them all at a good level. You have tracked these creatures most of your life and learn every little bit of information about them. In doing such, you can choose a specific type of dragon that you are best with and sought after most of your life, perhaps due to past experiences, and have advantage on tracking them, understanding them and dodging their attacks.

You can choose this if dragons are your choice animal or if you have taken the Variant of this background, the Dragon Slayer. You know dragons and you know how they work, a specific type of dragon above all else. You have advantage upon tracking them and perception checks if they are near, and cannot be surprised if they attack. You have advantage on avoiding their attacks as well as attacking them, since you have learned not just about their behavior, but how they hunt and defend, knowing the weak points in their body and how they move.