Betas are items that were available only in the beta testing stage of animal jam here's a few

rarity scale-

barely rare

slightly rare- some are this 

rare- some are this

fairly rare- some are this

very rare

extremely rare  

what to trade- for some you can trade a few rare tag rares and get it for others maybe a worse beta  

what to add- a few rare item mondays  

what is the rarity scale