You’veprobablyheardofworkingdogsthathelppoliceofficers,...
问题详情：You’veprobablyheardofworkingdogsthathelppoliceofficers,orhorsesthathelpfarmers.Didyouknowthatcarrierpigeons(信鸽)canbetrainedtohelppeopletoo?Herearesomeexamples.MailmanCarrierpigeonscanbetrai...