Corvid Thanatology (CROW FUNERALS) with Kaeli Swift

Episode Summary

Executive Summary: Allie Ward interviews biologist Kaylee Swift about corvid thanatology—the study of how crows respond to death. The episode mixes humor with research on crow intelligence, crow vs. raven differences, mask-based facial recognition studies, and PET-scan experiments using dead crows to probe brain activity and mourning behavior.

Main Topics: Corvid Thanatology and the premise of crow funerals (Priority: 5/5): The episode centers on why crows gather around dead crows, alarm-call, mob, and sometimes engage in unusual behaviors that resemble mourning or death-related social responses. Kaylee Swift’s path to crow research (Priority: 4/5): Swift describes her accelerated academic path, how her interest in animal behavior and social intelligence led her to crows, and how she joined a lab already studying crow cognition and facial recognition. Crow intelligence and social cognition (Priority: 5/5): The discussion frames crows as cognitively advanced birds whose social complexity may have driven brain evolution, challenging old assumptions that birds are less intelligent than mammals. Crow vs. raven identification and behavior (Priority: 3/5): Ward and Swift review the main physical and vocal differences between crows and ravens, while also comparing their reputations for creepiness and vocal mimicry. Facial recognition and mask experiments (Priority: 4/5): Swift explains prior work showing crows recognize human faces and can scold people who previously trapped them, with the recognition spreading through local crow populations. PET-scan methodology for studying crow brains (Priority: 5/5): The research uses FDG PET scans with radioactive glucose to measure brain activity after birds are shown stimuli such as dead crows, familiar people, or empty rooms, then scans which regions retain the tracer. Observed crow responses to death (Priority: 5/5): Swift recounts common and rare field behaviors, including alarm calls, mobbing, touching the body, placing objects near the corpse, and in rare cases sexual behavior around dead crows.

Key Arguments: Crow responses to dead conspecifics are widespread and behaviorally complex, not merely instinctive noise; alarm calling often recruits a mob of other birds. Crow intelligence deserves more recognition because their social lives likely require significant cognitive power, supporting the social intelligence hypothesis. The crow research is valuable because it combines field observation with brain imaging to connect external behavior with internal neural processing. Crows can recognize individual human faces and communicate that threat information socially, demonstrating advanced memory and social learning. Some behaviors around dead crows may reflect multiple competing states at once—fear, territoriality, breeding hormones, and attention to death—rather than a single human-like emotion. Using PET scans with glucose tracers allows researchers to infer what brain regions are active when crows process death-related stimuli without needing an MRI, which crows would not tolerate.

Data Points: Academic timeline: 2 degrees in 6 years - Swift describes how quickly she completed her training before starting a postdoc in Denali. PhD completion window: Just over 3 years - Swift finished her dissertation research on crow death behaviors very quickly. Defense timing: Friday night at 9:30 - She defended her PhD at the last possible moment before the quarter ended. Acclimation before imaging: A few weeks - Captured crows are allowed time to adjust to captivity before PET imaging. Stimulus window: About 15 minutes - Researchers have a short time to expose the bird to the test stimulus after FDG injection. Scanning window: About 45 minutes - The radioactive tracer must be imaged before it begins to degrade. Sexual behavior frequency: About 4% - Swift reports that in a small portion of observations, crows attempted copulation with dead crows. Touching behavior frequency: About a quarter of the time - During breeding season, some crows approached and touched dead crows in various ways.

Pivotal Quotes: "Nothing is more goth than that." — Allie Ward: Ward introduces crow funerals as the episode’s spooky central image. "I cried a lot." — Kaylee Swift: Swift explains how she managed the pressure of finishing her PhD on a rapid timeline. "We had one woman send us pictures of a crow... and then it left the wrapper right there by the body." — Allie Ward quoting research anecdotes: Ward describes a listener-submitted example of a crow leaving an object near a dead crow.

Implications: The episode suggests crows are far more cognitively and socially sophisticated than many people assume. For listeners, it reframes death behaviors as a rich research frontier and highlights how bird behavior can reveal complex brains.