I have now explained how, I believe, the wonderful fact of two distinctly defined castes of sterile workers existing in the same nest, both widely different from each other and from their parents, has originated.
Oraintxe azaldu dut nola sortu den, nire ustez, inurri mota berean argi zehazturiko langile antzuen bi kasta, elkarren artean eta gurasoengandik oso diferenteak, izatea den egitate harrigarria.