LifeZebrafish seem to be able to count when they are just four days old Just a few days after hatching, zebrafish larvae can discriminate between bigger and smaller numbers, suggesting they may have an innate numerical ability News
LifeStingrays and zebra mbuna fish know how to add and subtract Stingrays and zebra mbuna fish shown fewer than five shapes can add or subtract "one" from the total to gain a reward News