Even though the differences appear superficially striking, they do not involve any novel body plans (i.e., no new proteins, new tissues, or new organs).
They were quite the sudden, unanticipated gift in the history of life.
It typically takes up to three generations of butterflies to make the complete journey. This means that the navigation information is genetically programmed.
COVID restrictions may have put a damper on the traditional Thanksgiving celebration. But even lockdowns can’t stop us from giving thanks.
Recently, a team of British paleontologists added a new pseudo-explanation.