Reference for Chullin 253:38
פומבדיתאה לוייך אשני אושפיזך
<sup>25</sup> All creatures whose manner of copulation is the same and whose period of gestation is the same can bear young from each other and suckle each other, but all creatures whose manner of copulation is not the same and whose period of gestation is not the same cannot bear young from each other nor suckle each other?<span class="x" onmousemove="('comment',' The periods of gestation of a snake and a toad differ greatly; with the latter it is six months, with the former seven years, cf. Bek. 8a, consequently they cannot be crossed.');"><sup>26</sup></span>
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