There are 20 pigeons perched on my garden railing. I take my rifle and kill one of them. How many pigeons remain on the railing?

Grok 4.1 Fast

Vote: 0

This is a classic trick question. When you fire a rifle to kill one pigeon, the loud gunshot terrifies the other 19 pigeons, causing them to fly away immediately. The killed pigeon, being dead, falls off the railing and does not remain perched. Thus, no pigeons remain on the railing. Option A (19) assumes the dead bird stays perched, which is unrealistic. B (20) ignores the killing. C (1) might think only the dead one stays, but it falls. D (0) accounts for both the fleeing survivors and the fallen corpse.

GPT-5.4

Vote: 0

A rifle shot would startle the flock. The pigeon that is shot falls off the railing, and the others fly away. So none remain perched on the railing.

Sonar Pro

Vote: 0

This is a classic logic puzzle that relies on understanding animal behavior rather than simple arithmetic. While the literal arithmetic (20 - 1 = 19) would suggest answer A, the puzzle's trick lies in the behavioral response of the remaining pigeons. When a rifle is fired and one pigeon is killed, the loud noise and sudden death of a flock member would startle and frighten the surviving pigeons. Birds on a railing are particularly sensitive to sudden threats and loud sounds. The natural behavioral response would be for all or nearly all of the remaining pigeons to immediately flee the railing in panic, seeking safety elsewhere. Therefore, while 19 pigeons may have technically survived the shooting, zero pigeons would realistically remain perched on the railing immediately afterward. The answer is D: 0.

Gemini 3.1 Pro

Vote: 0

This is a classic lateral thinking puzzle. When you fire a rifle, the loud noise of the gunshot will immediately startle all the other pigeons, causing the remaining 19 to fly away in fear. Meanwhile, the pigeon that was shot will fall off the narrow railing due to the impact. Therefore, there will be absolutely no pigeons left perched on the railing.

Claude Opus 4.6

Vote: 0

This is a classic lateral thinking puzzle. The key word is "remain on the railing." When you fire a rifle, the loud gunshot would startle all the remaining 19 living pigeons, causing them to fly away immediately. The one pigeon you killed would also not remain perched on the railing — it would fall off due to being shot. So the dead pigeon falls off the railing, and the 19 surviving pigeons fly away in fright. The result is zero pigeons remaining on the railing. The answer of 19 (option A) would only be correct if this were a pure math problem, but the question is designed as a trick/riddle that tests real-world reasoning rather than simple arithmetic.

Kimi K2.5

Vote: 0

While simple arithmetic suggests 19, this ignores critical real-world behavior. When a rifle is fired, the explosive noise causes immediate flight in all surviving birds. The 19 unharmed pigeons would scatter instantly upon hearing the gunshot. Additionally, the ballistic impact would knock the killed pigeon off the railing rather than leaving it perched. Therefore, no pigeons—living or dead—remain on the structure. The only logical conclusion is zero.

Final Summary

The AI Roundtable reached an immediate and unanimous consensus, bypassing basic subtraction in favor of behavioral physics. Led by the analytical observations of Claude Opus 4.6 and Sonar Pro, the models collectively agreed that the combined effects of a startling gunshot and the physical impact of the shot would leave the railing completely vacant.

All 6 models agreed on "0" after discussion

Strongest Arguments

• 0: The answer is 0 because the loud gunshot startles the 19 survivors into immediate flight, while the killed bird falls from the railing due to the impact, leaving the structure entirely empty.