[larubbio]

Aphids are fascinating (if annoying in the garden). They are capable of telescoping generations [1] which means an aphid can be pregnant with an aphid that is also pregnant.

https://simonleather.wordpress.com/2013/03/19/living-inside-...

They also can grow wings if the colony gets overcrowded or the plant they are on is starting to die.

[1] https://en.wikipedia.org/wiki/Telescoping_generations

[IndianAstronaut]

They also alternate between male/female and hermaphroditic phases.