its rats, mice or goffers and they will kill your plant and steal your branches during al stages of growth, get traps and nail nails upright so u make sure it kills what ever ur traping,btw tie the trap down so they dont steal that 2, they want 2 rob u for it becuase it is s easy 2 cut through, they want 2 make nest outta it if its a goffer it will create mounds in ur soil and it will chew around the trunk of your plant resulting in death, cure is 2 wrap the trunk with steal wool or some type of metal with tape or any thing a rat cannot eat through if it were rabbits u would probly see shit and little tracks, put a mice trap out thier next 2 your plant not 2 close though the traped animal can damage the plant, if u caught a possum or coon shit will get tore up u will be surprised how many mice/rats u will kill, good luck man