阅读理解Humans' invention of zero was vital for modernmathematics and science, but we're not the only species to consider nothinga number. Parrots and monkeys understand the concept of zero, and now bees havejoined the club, too. Honey bees are known to have some numerical (数字的) skills such as the ability to count to four, whichmay come in handy when keeping track of landmarks in their environment. To seewhether these abilities extended to understanding zero, researchers trained 10bees to identify the smaller of two numbers. Across a series of trials, theyshowed the insects two diffe