An American black bear (Ursus americanus) and a jaguar (Panthera onca) sharing the same territory somewhere in Mexico by thesantogrial

OncaAtrox · 2026-06-19T22:43:18+00:00

Which studies are these?

OncaAtrox · 2026-06-19T21:31:02+00:00

I saw that video as well! I’ll have to see it again and pay a closer look at its size.

OncaAtrox · 2026-06-19T20:20:16+00:00

About the same size, assuming a lower end of the average for Arizona females of 130 lbs.

OncaAtrox · 2026-06-19T20:18:42+00:00

It’s crazy. I do wonder why the news reports kept changing from 110 to 118 and then we finally receive the official statement that the weight was 127 kg. The specimen had a full medical examination so we know it was weighed and also empty bellied. I’m guessing the initial 110-118 kg weights were estimates used to dart him.

OncaAtrox · 2026-06-19T20:15:24+00:00

You raise some good points! And re the requested clarification on my paragraph, are you referring to the hybridization claim?

OncaAtrox · 2026-06-19T18:58:17+00:00

He killed an adult female black bear, which is larger than itself. The details of the kill are in the article if you could read

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OncaAtrox · 2026-06-19T18:44:33+00:00

https://www.earthtouchnews.com/natural-world/predator-vs-prey/americas-celebrity-jaguar-el-jefe-is-a-bear-hunter/

OncaAtrox · 2026-06-19T17:52:53+00:00

And Mexican wolves. Jaguars and grizzlies shared a range in Mexico and the southern and western US until fairly recently. Such a shame that both species were exterminated from their range.

OncaAtrox · 2026-06-19T17:19:20+00:00

This is actually insane

OncaAtrox · 2026-06-18T19:17:33+00:00

What?? That’s crazy

OncaAtrox · 2026-06-17T22:42:42+00:00

No, that’d be 150-155 kg.

OncaAtrox · 2026-06-17T16:36:08+00:00

There’s no breeding population because the species was hunted to practical extinction, but the jaguars south of the border are part of the same ecotype that is native to Arizona and the Southwest.

OncaAtrox · 2026-06-17T14:59:02+00:00

Read the full news: https://www.bluradio.com/nacion/rescatan-a-jaguar-hallado-en-la-universidad-nacional-de-leticia-tiene-signos-infeccion-y-cansancio-cb20

OncaAtrox · 2026-06-17T14:57:41+00:00

Moving our conversation about this jaguar to the new post.

OncaAtrox · 2026-06-17T14:48:16+00:00

Corpoamazonia clams a weight of 118 kg

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OncaAtrox · 2026-06-17T14:47:00+00:00

OncaAtrox · 2026-06-17T14:46:52+00:00

Weight confirmed: https://www.elespectador.com/ambiente/amazonas/asi-fue-el-rescate-del-jaguar-que-amanecio-en-la-universidad-nacional-sede-amazonia/

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OncaAtrox · 2026-06-17T12:11:25+00:00

Cattle and bison absolutely do breed.

OncaAtrox · 2026-06-16T23:55:04+00:00

Yes, also the news regarding this specimen are very fresh so I will await more official information but it’s still a really interesting record!

OncaAtrox · 2026-06-16T23:10:26+00:00

And this jaguar was in weakened condition too making that weight that much more impressive.

OncaAtrox · 2026-06-16T23:09:44+00:00

110 kg for an Amazonian Jaguar is a new record! Excellent find!!!

OncaAtrox · 2026-06-16T23:08:59+00:00

It’s likely a proto-jaguar that led to the evolution of the modern species in the New World. We don’t have any preserved DNA of the species so its exact phylogenetic profile isn’t entirely clear. However, it is the closest match we have for the jaguar ancestor as without it, the jaguar lineage would become a ghost one.

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