Hi, SoloMoon! How are you doing? So, I recall you saying somewhere along the way how it made no sense for Marco to morph a bee in #40 or an ant in #45, because of their horrible experiences with social insects (true!). So, what would you have chosen instead? Now that I think about it, maybe they could've used the termite morph on #45 as he's manipulating the alien device. (TL;DR: If you had the chance to decide, which morphs on which book covers would you replace, and with what else instead?)
I think that if I could replace the bees in #40 with a different morph, it'd be... housefly. Which is a really boring answer, because flies get used in most books already, but that just seems most practical.
And I guess that's my broader answer: I don't know. If we were writing from a strictly optimizing standpoint, then the kids should use a) gull morph, b) fly morph, or c) polar bear morph. End of list. But that's taking out 90% of what makes the series cool, as rational optimization usually does.
It's an adventure story about how cool Earth can be; it should invent excuses for the kids to acquire gulls and hawks and ducks and cockatiels. Otherwise, if we take rational optimization to its logical end point, they shouldn't bother morphing at all and should instead attack the yeerk pool with bombs and guns. Which sucks, and isn't remotely on theme.
the easy answer is he still morphs bee in 40. But instead of an invasive to north america honey bee he morphs one of the thousands of native bee species that aren't eusocial and then our 90s past selves get a lesson in native bees of north america and how like 95% don't live in hives.
and it's been a while since I read 45 but didn't Marco just use it to scare his dad into believing the whole secret alien war thing? He could have morphed flea or spider or literally anything else.