Can YOU tell which animal is different? Maths question meant for first-grade pupils leaves the internet puzzled

The teacher who said it is about logic is correct,not the teacher who said it was about counting (not a mathematics teacher obviously). The questions are teaching logic (and sets or groups). We know the answers to 1) and 2) - they are about the odd one out, not counting their bits. 3) uses the same logic - therefore the odd one out is the chicken. It has nothing to do with how many legs it has, it has to do with grouping similar things with an odd one out. Children will get 1) right so if they use the same logic, they will get 2) right. Then using the same logic they should get 3) right although it is a bit more difficult. My children in Austraila also learned this in Grade One, but just to be certain, I checked with my husband who is a mathematics professor.[CN]

老师说符合逻辑就是正确的，不是那个说这些都是计算的那个老师说的（明显不是数学老师吗），这个问题是在教逻辑啊（集合或是组合）。我们知道1）和2）的一样的 - 如果不算数量的话，他们明显都跟其他动物有不同点。3）也可以用同一个逻辑 - 因而不同的是鸡。跟有多少条腿一点关系都没有，而是找出其他动物的共同点，把例外的那个剔除掉。同理，孩子们也可以选1），必定可以选择2）。证明3）跟1）和2）一样有点难，但是可以证明是正确的。我一年级的学生也学到这个，为了确保无误，我还和我丈夫确认过，他是数学教授。

Chicken has no ears[CN]

鸡没有耳朵。

Oh my god really? The chicken is different because it has feathers and the rest have fur and they are mammals. The stupidest way to get attention is post this online.[CN]

哦，天，是真的吗？鸡不同，是因为它有羽毛，其他动物有的是皮毛，还是哺乳动物。这种引起注意网上发表的方法也太蠢了