AFRICAN FLY NURSES ITS YOUNG
Tsetse flies are the only invertebrates that nurse their young. The small creature – down to 6mm in size – is also mammalian in other ways: for example the fly gives birth to living offspring, not eggs.
Most insects lay eggs in large numbers – sometimes in the thousands – but do not pay much attention to them thereafter. If there are enough eggs, a few usually survive. But each
