What is the largest size and weight an animal can be?

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Discussion Overview

The discussion centers on the theoretical limits of size and weight for animals, particularly comparing land and sea animals. Participants explore the implications of the square-cube law and evolutionary factors affecting size, while seeking to establish mathematical limits without considering ecological factors like food consumption.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant suggests that the square-cube law imposes limits on animal size, proposing that sea animals can grow larger than land animals due to buoyancy.
  • Another participant mentions the titanosaur Argentinosaurus huinculensis as a potential limit for land animals, citing its size and weight.
  • Some participants express frustration with existing resources, indicating that they do not adequately address the upper limits for land and sea animals.
  • One participant questions whether the inquiry should be limited to animals, pointing out that larger organisms, such as certain fungi, exist on Earth.
  • Another participant speculates that evolutionary pathways could have led to different body structures, potentially allowing for larger sizes in land quadrupeds.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the upper limits of animal size. There are competing views regarding the applicability of the square-cube law, the relevance of buoyancy, and whether the discussion should include non-animal organisms.

Contextual Notes

The discussion lacks definitive answers and is constrained by assumptions about evolutionary biology and ecological factors. There is also ambiguity regarding the definitions of "animal" and "organism" in the context of size limits.

Who May Find This Useful

Readers interested in evolutionary biology, biomechanics, and the limits of organismal size may find this discussion relevant.

iDimension
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Due to the square cube law there is a limit to how large an animal can be. I believe sea animals are capable of being much larger than land animals because the water supports their weight but what is the theoretical limit to how large a land animal can be and a sea animal? Excluding food consumption etc just purely mathematical limits.

From looking at wikipedia it seems the largest land animal ever was the titanosaur Argentinosaurus huinculensis which stood at between 30 and 50 metres and weighed between 80 and 100 tonnes. Is this pretty much the limit for a land animal?

Thanks.
 
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That article doesn't answer my question and neither did any of my other searches which I why I posted on here. I'm looking for an answer that works out what the upper limit might be for a land based animal and a sea based animal.
 
iDimension said:
That article doesn't answer my question and neither did any of my other searches which I why I posted on here. I'm looking for an answer that works out what the upper limit might be for a land based animal and a sea based animal.
Maybe that's because there is no answer.
 
Are you limiting your request to animals?

There are things alive on the Earth larger than Blue Whales.

I doubt there is any meaningful hard upper limit to their size, I mean, aside from the area of the Earth's landmasses.
 
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Perforce, we're limited to land quadrupeds. Had evolution turned a different way, more legs could allow more body mass...
 

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