The metadata for each token are on-chain and follow CIP-25. The metadata itself links to an image on IPFS in order to keep the data immutable and retrievable forever. The metadata are in the minting transaction of the token. To see the metadata go to pool.pm/{your-address} or pool.pm/{asset-id} to see the on chain data. First dodo ever minted: https://pool.pm/asset16ffwyqr2sy9yrespye6fkv66npupkygdm2vgt0