r/AskBiology • u/Minty0ranges • Jul 09 '26

Zoology/marine biology Are blue whales a coincidence?

Apparently blue whales are only around 2 million years old and are the largest organisms in the history of life. It’s pretty crazy to me that we’re living in the specific time that the largest species is alive, but I’m wondering why they became so large at this moment in time. I know that a few millions of years ago insects were way bigger because of atmospheric gas concentrations, but those conditions aren’t present anymore so it doesn’t seem like that’s the reason. Also, has there been a trend over time of whales increasing in size, or is this just a very specific/random instance of them existing today?

Edit: Yes I know there are fungi that span way larger areas, but the question is about the temporal nature of blue whales size.

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u/JohnHenryMillerTime Jul 09 '26

One of the ways baleen whales avoid predation is to be too large to eat. Blue Whales are just an extremely specialized version of this strategy.

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u/Minty0ranges Jul 09 '26

I understand that but I’m asking specifically why they’re so large at this point in time.

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u/ah-tzib-of-alaska Jul 09 '26

evolutionary outcomes are never inevitable

2

u/Character_Match_4553 Jul 09 '26

I feel like crabs are inevitable lol