Could hummingbird hearts make a human a better runner?

Zack D. Films' animated thought experiment trades the promise of endurance for fragile blood vessels and a lot of eating.

Channel: Zack D. Films Story of November 9, 2026Trari Newsroom

No. 6 on the daily chartNo. 1 on the Science chart

Why this story? One of the most watched videos since yesterday, with 6,396,114 views.

What If Humans Had Hummingbird Hearts 🤔

A hummingbird's racing heartbeat sounds like an upgrade for a runner. The tiny heart itself is another matter. A 3D animated Short shared by Zack D. Films takes that mismatch to an increasingly outlandish conclusion, drawing about 6.4 million views since yesterday.

In "What If Humans Had Hummingbird Hearts 🤔", the narrator explains that a single bird heart would supply far too little blood for a human brain. The animation's solution: pack the runner's chest with thousands of them. In this hypothetical, that brings more oxygen to the muscles, longer running and faster recovery, followed by blood vessels bursting under the pressure.

Then comes the grocery problem. The runner ends up at a dining table, eating rapidly to fuel all those beating hearts. Viewers have turned the crowded chest into imaginary doctor's appointments, where asking for someone's heart rate requires first specifying which heart.

Published on Trari

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Where next?

More from Zack D. FilmsOn today's chart 5.6M views since yesterdayZack D. Films' staircase paradox: steps that shrink but never get shorterA square, a marker and a piece of red string show why a path can look exactly like the diagonal and still be longer.Channel: Zack D. Films · Story of November 8, 2026 Also in Stories, mysteries and curiositiesWeekly growth +13.9% subscribers this weekRako's animated close calls turn to robots and live wiresThe short-story channel added 160,000 subscribers over the week, with a fresh batch of rescue tales and impossible predicaments.Channel: Rako · Story of November 9, 2026 A different discovery todayVideo taking off 12x its usual first dayKenan Thompson's Jeffries has a warning for Trump: "Knock it off, buster"SNL's post-midterm cold open crowds Trump, Vance, Hegseth and a real James Talarico into the Democrats' champagne party.Channel: Saturday Night Live · Story of November 9, 2026

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Could hummingbird hearts make a human a better runner? The full story on Trari: https://trari.com/en/story/zackdfilms-31674/?from=kit

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The numbers

The Short added roughly 6.4 million views since yesterday. Its first-day comment count was close to the channel's usual level for Shorts.

subscribers

29,600,000

▲ 100,000 in the last 7 days

total views

82,671,917,394

views per day

56,018,613

typical day: 109,597,690

the video

views

9,247,772

likes

305,378

comments

2,004

days online

2

subscribers: this channel and similar channels

Zack D. Films

29,600,000

Sean Andrew

7,510,000

Chills

6,170,000

oompaville

6,000,000

Vin

5,760,000

Tyler Blanchard

5,100,000

As of November 9, 2026 · Data source: Trari Social News, Trari Traffic Trends and Ranking Platform, Google YouTube

Subscriber, view, like and comment counts are YouTube's. Rates, usual days, rankings, comparisons and categories are Trari's own calculations.