Scientists Suggest Total Solar Eclipse May Prompt Dawn Behavior in Birds

On April 8, 2024, a total solar eclipse interrupted the daylight cycles of North American birds as they prepared for spring breeding. Researchers at Indiana University, after analyzing over 10,000 community observations and utilizing artificial intelligence to examine nearly 100,000 bird calls, discovered that bird behavior was significantly impacted by the few minutes of unexpected afternoon darkness. More than half of the bird species altered their biological rhythms, leading many to produce dawn choruses in the aftermath of the eclipse.



Circles indicate individual observations from the SolarBird app submitted on April 8, 2024. Image courtesy of Aguilar et al., doi: 10.1126/science.adx3025.

The daily and seasonal rhythms of birds are closely regulated by variations in light and darkness.

What occurs when these cycles are abruptly disrupted, such as during a total solar eclipse?

Previous research has explored the effects of solar eclipses on animal behavior, yet many studies have only provided scattered or anecdotal insights regarding animal responses.

Indiana University researcher Liz Aguilar and her team viewed the total solar eclipse in April 2024 as a unique research opportunity, offering an unprecedented natural experiment to observe how birds react to sudden light changes.

In preparation for the solar eclipse that would cast nearly four minutes of darkness over large regions of the central and eastern United States, they developed a smartphone app called SolarBird, which allows users to document bird behaviors in real time during the eclipse.

The citizen scientists’ contributions resulted in almost 10,000 observations spanning 5,000 km along the eclipse’s path.

Simultaneously, researchers deployed autonomous recording devices across southern Indiana to capture the calls of about 100,000 birds before, during, and after the totality.

These recordings were analyzed using BirdNet, an AI system capable of identifying species calls and measuring vocal activity.

Findings revealed that 29 out of 52 species detected exhibited significant changes in their singing behavior at various points during the event, although the eclipse’s effects varied among species.

In the moments leading up to the eclipse, 11 species were found to sing more than usual as darkness approached.

During the four minutes of darkness, 12 species reacted—some becoming silent, while others increased their vocal activity.

The most notable responses were observed after the sun re-emerged, with 19 species adjusting their songs to mimic a false dawn chorus.

Notably, barred owls hooted four times more frequently than usual, while robins—renowned for their pre-dawn melodies—hooted six times more than normal.

“These patterns indicate that the solar eclipse temporarily reset the internal clocks of certain birds, causing them to act as if a new day had commenced,” the researchers stated.

Their paper was published in the October 9, 2025 edition of the journal Science.

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Liz A. Aguilar et al. 2025. Total solar eclipses trigger dawn behavior in birds: Insights from acoustic recordings and crowd science. Science 390 (6769): 152-155; doi: 10.1126/science.adx3025

Source: www.sci.news

Ancient Fossilized Brains Prompt a Reevaluation of Spider Evolution

Morrison, a marine creature from the Cambrian period, could represent an early arachnid

Junnn11 @ni075 CC BY-SA 4.0

Research indicates that the brains of ancient sea creatures, dating back over 500 million years, were structured similarly to those of spiders. This challenges past theories that arachnids originated on land.

Morrison reflects a time of significant biological diversity increase, known as the Cambrian Explosion, when various animal groups began appearing in fossil records. These creatures possessed chelicerae, pincer-like mouthparts likely used for tearing into small prey.

Previous beliefs suggested that modern relatives of Morrison, which include horseshoe crabs, were connected to spiders. However, Nicholas Strausfeld and his team at the University of Arizona propose otherwise.

The researchers reexamined specimens of Mollisonia symmetrica, collected in 1925 from British Columbia, Canada, and now housed at Harvard University’s Comparative Zoology Museum. Strausfeld and his colleagues identified a brain structure that had previously been overlooked.

In horseshoe crabs, the chelicerae exhibit a neural connection at the back of the brain; however, in Morrison, this structure was inverted, with chelicerae linked to two neural regions that offered a perspective on the forefront of the nervous system.

Strausfeld notes that this orientation is “characteristic of arachnid brains.” Unlike the brains of crustaceans and insects, which are folded inward, arachnids have crucial areas for planning agile movements situated at the back. This architecture likely contributes to the remarkable agility and speed seen in spiders.

While it was previously thought that arachnids evolved on land, the earliest existing land fossils of obvious arachnids will not appear for millions of years later, according to Strausfeld. “Perhaps the first arachnids inhabited tidal environments, like Morrison, in search of prey,” he mentions.

Mike Lee, a researcher at Flinders University in Adelaide, Australia, who was not involved in the study, suggests that Morrison may now be viewed as a primitive arachnid. “We now recognize it possessed a brain akin to that of a spider, indicating it was an aquatic relative of the early spiders and scorpions,” Lee states.

Nonetheless, he cautions that while researchers strive to extract as much insight as possible from a single fossil, there remains a degree of ambiguity in interpretation. “It’s akin to attempting to piece together a unique Pavlova after it has been dropped,” he explains.

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Source: www.newscientist.com

‘Divergent Views on Personalization in Big Tech Prompt New EU Calls for Default Turning Off of Profiling-Based Content Feeds’

Another policy tug-of-war may be emerging in the European Union over Big Tech’s content recommendation systems, with the European Commission ruling out profiling-based content feeds (also known as “personalization” engines that process user data). Many members of Congress are calling for the government to curb this. To determine what content to display. The tracking and profiling of users by mainstream platforms to power “personalized” content feeds has long raised concerns about potential harm to individuals and democratic societies, and whether this technology is fueling social media addiction. , some critics say poses mental health risks to vulnerable people. There are also concerns that this technology is undermining social cohesion through its tendency to amplify divisive and polarizing content that can push individual anger and anger towards political extremes.

Of letter, 17 MPs from political groups including S&D, the Left, the Greens, EPP and Renew Europe have signed the petition, which calls for recommendation systems on technology platforms to be switched off by default. The idea emerged during negotiations over the bloc’s Digital Services Act (DSA). ), but it was not included in the final regulations because it did not have a democratic majority. Instead, EU lawmakers agreed to transparency measures for recommender systems, along with a requirement that large platforms (so-called VLOPs) must provide at least one content feed that is not based on profiling. But in a letter, lawmakers are calling for a complete dedefault on the technology. “Interaction-based recommender systems, especially hyper-personalized systems, pose a serious threat to the public and society as a whole, as they prioritize emotional and extreme content and target individuals who are particularly likely to be provoked. ” they wrote. “This insidious cycle exposes users to sensational and dangerous content, prolonging their engagement with the platform in order to maximize ad revenue.”

Amnesty International’s experiment on TikTok showed that the algorithm were exposed to videos glorifying suicide within just an hour. Additionally, Meta’s internal research found that 64% of joins to extremist groups were due to recommended tools, and that extremists It has become clear that we are exacerbating the spread of ideology.” The phone is: Draft online safety guidelines for video sharing platforms, was announced earlier this month by the Irish Media Commission (Coimisiún na Meán). The committee will be responsible for overseeing the DSA when regulations become enforceable for covered services next February. Coimisiún na Meán is currently consulting on guidance proposing that video sharing platforms “take steps to ensure that profiling-based recommendation algorithms are turned off by default.” The publication of the guidance occurred after the following episodes. violent civil unrest in Dublin The country’s police authorities suggested the attack was fabricated by far-right “hooligans” with false information spread on social media and messaging apps. And earlier this week, Irish Civil Liberties and Human Rights Council ICCL, which has been campaigning on digital rights issues for many years, also called on the European Commission to support the Koimisiun na Mean proposal and to make it public. my report They say social media algorithms are tearing society apart and are calling for personalized feeds to be turned off by default.

In their letter, MEPs said they also accepted proposals from Ireland’s media regulator, which similarly tend to promote “emotional and extremist content” that they say could undermine civic cohesion. It suggests that it “effectively” addresses issues related to recommender systems. The letter also references recently adopted regulations. Report by the European Parliament On the addictive design of online services and consumer protection, they highlight the negative impact of recommender systems on online services, which involve the profiling of individuals, especially minors. , which aims to keep users on the platform for as long as possible, thus manipulating them.” Artificial amplification of hatred, suicide, self-harm, and disinformation. ” “We call on the European Commission to follow Ireland’s lead and not only approve this measure under TRIS, but also take decisive action.” [Technical Regulations Information System] In addition to following the steps, you can also recommend this measure as a mitigation measure for large online platforms to take. [VLOPs] 35(1)(c) of the Digital Services Act, to give citizens meaningful control over their data and online environment,” the MEPs wrote, adding: “The protection of our citizens, especially young people, is of paramount importance” We believe that the European Commission has an important role to play in ensuring a safe digital environment for everyone. We look forward to your prompt and decisive action on this issue. ”

Under TRIS, EU member states must submit proposals before they are adopted into national law so that the EU can carry out a legal review to ensure that they are consistent with the bloc’s rules, in this case the DSA. draft technical regulations must be notified to the European Commission. . This system means that domestic laws that seek to “golden” EU regulations are unlikely to pass scrutiny. As such, the Irish Media Commission’s proposal to turn off video platforms’ recommender systems by default appears to go further than the text of the relevant legislation and may not survive the TRIS process. be. However, no company has gone that far yet. And clearly not the kind of step that ad-funded, engagement-driven platforms would choose as their commercial default.

When we asked, the European Commission declined public comment on the MEP’s letter (or the ICCL report). Instead, the spokesperson pointed to the “clear” obligations regarding her VLOP’s recommendation system set out in Article 38 of the DSA. This mandate requires platforms to provide at least one non-profiling-based option for each of these systems. However, we were able to discuss the profiling feed debate with EU officials who provided background to speak more freely. They agreed that platforms could choose to turn off profiling-based recommender systems by default as part of DSA systemic risk mitigation compliance, but they still do not have initiatives that stray too far from their own policies. I have confirmed that the platform you are using does not exist. So far, we have only seen examples where non-profiling feeds are optionally provided to users, such as on TikTok and Instagram, in order to meet the aforementioned (Article 38) DSA requirement to provide users with the option of circumvention. not. Personalization of this type of content. However, this requires active opt-out by the user. On the other hand, setting a feed to non-profiling by default is clearly a stronger type of content regulation, as it requires no user action to enable. EU officials we spoke to said that the European Commission, in its capacity as enforcer of the DSA on VLOPs, is considering a recommender system, including the formal process initiated in relation to X earlier this week. admitted that. The recommendation system has also been the focus of some of the formal requests for information the commission has sent to his VLOP, including one to Instagram that focuses on child safety risks. they spoke. And they agreed that the EU could use its enforcer role, or law-abiding power, to force large platforms to stop personalized feeds by default. However, they indicated that the commission would only take such action if it determined it would be effective in mitigating a particular risk. The official noted that multiple types of profiling-based content feeds are in place, even on a platform-by-platform basis, and emphasized that each must be considered in context.

More generally, they appealed for “nuance” in the debate over the risks of recommendation systems. They suggested that the Commission’s approach here would be to conduct a case-by-case assessment of concerns and advocate for data-driven policy interventions on VLOPs rather than blanket measures. did. After all, it’s a collection of platforms as diverse as video-sharing and social media giants, as well as retail and information services and (most recently) porn sites. The risk that an enforcement decision will not be selected by legal challenge in the absence of solid evidence to support the decision is clearly a concern for the Commission. The official also wants to collect more information before making a decision on whether to recommend.

Source: techcrunch.com