The largest mountain lion identified in the official sources is reported at 276 pounds (about 125 kilograms). The National Park Service calls a 276-pound animal the largest mountain lion ever documented, while a Government of British Columbia guide printed in 1994 calls a 276-pound Arizona cougar the heaviest recorded.
That does not prove the animal was caught alive. The available agency pages do not give its name, capture or death circumstances, weighing method, date, or original weighing record. The most accurate answer is therefore “a reported 276-pound documented or recorded mountain lion,” not a verified live-capture world record.
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The reported maximum: 276 pounds
The strongest agreement in the official material is around one exceptional measurement: 276 pounds, or approximately 125 kilograms. The National Park Service account for Lake Mead National Recreation Area says, “The largest mountain lion ever to be documented weighed 276 pounds, but a lion of this size is extremely rare.” A separate Government of British Columbia booklet, Cougar in British Columbia, printed in March 1994, states that the heaviest recorded was an Arizona cougar weighing 276 pounds.
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Those two statements are useful corroboration, but they are not the same as a modern, independently audited record registry. Neither page identifies the animal or supplies the original scale ticket, measurement protocol, exact date, or circumstances in which the weight was obtained. The figure should be presented with its attribution and limitations attached.
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Why “ever caught” needs a qualification
“Caught” can mean several different things in wildlife reporting. It may refer to a live capture for research, a legally trapped animal, an animal killed during a hunt, or simply an animal that was documented and weighed. The 276-pound sources establish documentation or a historical record; they do not establish a confirmed live capture.
That distinction matters because a live-capture record normally has a chain of details: the animal’s identification number, capture date and location, handling team, scale type, and whether the reading was corrected for equipment or stomach contents. Those details are absent from the pages that report 276 pounds. Calling it “the biggest cougar ever caught alive” would add a fact the sources do not support.
Mountain lion, cougar and puma are common names for the same species, Puma concolor. Different agencies use different common names and publish figures for their own regions, so a weight should always be read with its geographic and historical context.
What the two 276-pound accounts actually say
| Source | Date or edition | Claim | What is not supplied |
|---|---|---|---|
| National Park Service, Lake Mead National Recreation Area | Page date not stated | Largest mountain lion ever documented weighed 276 pounds; such size is extremely rare. | Animal identity, original weighing record, method, and whether it was captured alive. |
| Government of British Columbia, Cougar in British Columbia | Printed March 1994 | “The heaviest recorded was an Arizona cougar which weighed 276 pounds.” | Capture or death circumstances, original record, scale details, and a current registry update. |
The matching number is why 276 pounds is the best-supported answer available here. The older British Columbia publication should still be described as a 1994 historical account, rather than as proof that a current wildlife authority maintains a continuously audited global ranking.
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How exceptional is a 276-pound mountain lion?
Regional wildlife agencies publish substantially lower typical figures. The New Mexico Department of Game and Fish page, updated August 19, 2026, says adult males often measure up to 150–200 pounds and adult females average 90–110 pounds. The Texas Parks and Wildlife Department species page gives a general range of 70–170 pounds.
| Agency context | Published weight information | How to interpret it |
|---|---|---|
| New Mexico Department of Game and Fish | Adult males often up to 150–200 pounds; adult females average 90–110 pounds. | Regional descriptions with separate male and female wording; not a continent-wide statistical baseline. |
| Texas Parks and Wildlife Department | General range of 70–170 pounds. | A broad agency range, not an assertion that every population shares the same distribution. |
| Reported historical maximum | 276 pounds. | An exceptional documented or recorded claim, far above the figures in the two agency summaries. |
These numbers should not be treated as a formal statistical comparison because the agencies may use different sampling, geography, age classes and definitions of “average,” “often,” or “range.” They do show the scale of the outlier: 276 pounds is well above the upper figures commonly cited for adult males in the regional descriptions.
The best-documented capture example is a different record
A verified research capture can be easier to document than a historical maximum. In the National Park Service’s Puma Profiles account for P-47, the male weighed exactly 150 pounds at his last capture in January 2018. NPS writes that this tied for the largest among all mountain lions in the history of its study.
P-47’s figure answers a narrower question: he was one of the heaviest animals in that particular NPS study and the weight was associated with a dated capture. It does not replace the 276-pound historical claim, because the two records have different scopes. One is a study-specific recapture record with a stated date; the other is a broader “largest documented” or “heaviest recorded” assertion whose original measurement details are not shown on the cited pages.
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| Record type | Weight | Scope | Capture evidence |
|---|---|---|---|
| Historical documented/heaviest claim | 276 pounds | Presented as the largest documented or heaviest recorded mountain lion. | Sources do not confirm a live capture or provide the original measurement record. |
| NPS study animal P-47 | 150 pounds | Tied for the largest in the history of that NPS study. | Last capture identified as January 2018. |
Was the 276-pound mountain lion real?
The responsible answer is that two government sources report the same extraordinary weight, which makes the claim worth taking seriously, but the pages do not provide enough primary documentation to call it an audited world record. The NPS page is an agency statement, and the British Columbia source is a government booklet from 1994 that attributes the weight to an Arizona cougar.
There is no animal name, tag number, exact location beyond the Arizona attribution in the British Columbia account, or description of how the weight was taken. The sources also do not explain whether the measurement was made immediately after capture, after death, with equipment attached, or under another condition. Those omissions do not disprove the number; they define how confidently it can be described.
A precise article should therefore use wording such as “reported at 276 pounds,” “the largest mountain lion documented by the cited NPS page,” or “the heaviest recorded in a 1994 British Columbia government guide.” It should avoid “definitively the world-record cougar,” “largest ever caught alive,” or claims that the animal’s measurement has been independently reweighed.
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When you encounter a claimed maximum weight, check five details before comparing it with another animal:
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- Scope: Is the statement about a global species record, a state or province, or one research project?
- Animal status: Does “caught” mean live capture, or is the source only reporting documentation?
- Date: Is it a current agency page, a dated field study, or an older publication?
- Measurement: Does the source identify the scale, conditions and original record?
- Population context: Are sex, age, geography and season specified?
Applying those checks prevents a study animal such as P-47 from being compared as though it were a worldwide maximum, and prevents a historical statement from being presented as a newly verified capture.
Why weights vary between mountain lions
Agency figures naturally differ because mountain lions occupy a wide geographic range and because reports use different categories. A male “often up to” a certain weight is not the same claim as a population average, and a general range does not show how many animals fall near either endpoint. Sex, age, body condition and local prey availability can all affect an individual’s mass, but the cited pages do not provide a single standardized formula for combining their numbers.
That is why the New Mexico and Texas figures are best used as context rather than as a mathematical test of the 276-pound claim. They establish what agencies commonly describe in their jurisdictions; they do not create a unified continental reference sample.
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What would make the record easier to verify?
A fully documented record would normally let readers trace the number back to a specific animal and measurement event. The most useful supporting material would include:
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- An animal identifier, such as a research tag or catalog number.
- The exact capture, collection or weighing date and location.
- The reason for handling the animal and whether it was alive at weighing.
- Scale make, capacity, calibration and the recorded gross and tare weights.
- The animal’s sex, age estimate and physical condition.
- An original field sheet, technical report or archived agency record.
- An explanation of whether equipment, restraints or stomach contents affected the reading.
The sources available for the 276-pound claim do not supply those particulars. Until such details are published, the weight remains a strongly repeated official report rather than a fully reproducible measurement.
Where to learn more about mountain lions
For regional conservation and identification information, the California Department of Fish and Wildlife’s Mountain Lions in California page lists a field guide to the mountain lions of Texas among its resources. A field guide can help with terminology, tracks, range and natural-history background, but the listing does not independently verify the 276-pound figure and does not establish a current retail edition or price.
Readers should also remember that seeing a very large-looking mountain lion in a photograph is not a reliable way to estimate weight. Camera distance, lens perspective, fur condition and the animal’s posture can make individuals appear much larger or smaller than they are. A scale measurement with documented conditions is the meaningful comparison.
Bottom line on the biggest cougar
The most defensible answer to “What is the largest mountain lion ever caught?” is: official sources report a 276-pound mountain lion as the largest documented or heaviest recorded. The evidence does not establish that this particular animal was caught alive, and it does not include the original weighing record. The 150-pound P-47 measurement is the clearest dated live-capture example in the cited material, but it is a record within one NPS study, not a replacement for the broader historical claim.
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