first spacecraft to return safely
... that two Russian tortoises were aboard the first spacecraft to return safely from a trip around the Moon?
... that two <a href="./Russian_tortoise" id="mwBm8" rel="mw:WikiLink" title="Russian tortoise">Russian tortoises</a> were aboard the <b id="mwBnA"><a href="./Zond_5" id="mwBnE" rel="mw:WikiLink" title="Zond 5">first spacecraft to return safely</a></b> from a trip around the Moon?