Rewards refers to animals, breeds, customizations and other items that are, or previously were, obtainable through certain means.
Super Milestones
Super Milestones provide a way to unlock specific items through reaching certain goals, such as performing Super Jump Rolls, eating coconuts, or breaking crates.
Drops
Upon completing a match, a player is rewarded XP and 
Animal DNA, with a chance to also receive
Super Serum, Super Magnets, and/or Customizations.
Level
Reaching certain levels unlocks the ability to obtain specific types of Animal DNA as a random drop. Levels can also award customizations, however there is currently only one apparel item given in this manner: the Rebellion Helmet, given to the player for reaching Level 30.
Research Lab
Research Lab allows players to unlock new animals and breeds by spending Animal DNA and 
Super Serum.