Youtube video explaining the founder effect, genetic bottlenecks and genetic drift.
BBC news story from 2017 – researchers have observed speciation occurring in a population of Galapagos finches.
Animation on genetic drift, step-through or narrated with quiz.
Youtube video explaining evolutionary mechanisms from the Kurzgesagt – in a Nutshell channel.
Text based “lectures” on evolution
Animation on natural selection with choice of step-through or narrated version, followed by a quiz.