Animal behavior

It’s an observation as old as humans gathering around campfires: Light at night can draw an erratically circling crowd of insects. In art, music and literature, this spectacle is an enduring metaphor for dangerous but irresistible attractions. And watching their frenetic movements really gives the sense that something is wrong – that instead of finding food and evading predators, these nocturnal pilots are trapped by a light. Sadly, centuries of witnessing what happens have produced little certainty about why it happens. How does a simple light change fast, precise navigators into helpless, flittering captives? We are researchers examining flight, vision and evolution, and we have used high-speed tracking techniques in newly published research to provide an answer. The reason insects fly around light will surprise you. Moths to a flame? Many old explanations for this hypnotic behavior have not fully panned out. An early notion w...

Human-driven climate change is increasingly shaping the Earth’s living environments. Rising temperatures, rapid shifts in rainfall and seasonality, and ocean acidification are presenting altered environments to many animal species. How do animals adjust to these new, often extreme, conditions? Animal nervous systems play a central role in both enabling and limiting how they respond to changing climates. Two of my main research interests as a biologist and neuroscientist involve understanding how animals accommodate temperature extremes and identifying the forces that shape the structure and function of animal nervous systems, especially brains. The intersection of these interests led me to explore the effects of climate on nervous systems and how animals will likely respond to rapidly shifting environments. All major functions of the nervous system – sense detection, mental processing and behavior direction – are critical. They allow animals to navigate their e...

Many sharks and rays are known to breach, leaping fully or partly out of the water. In a recent study, colleagues and I reviewed research on breaching and ranked the most commonly hypothesized functions for it. We found that removal of external parasites was the most frequently proposed explanation, followed by predators chasing their prey; predators concentrating or stunning their prey; males chasing females during courtship; and animals fleeing predators, such as a ray escaping from a hammerhead shark in shallow water. We found that the highest percentage of breaches, measured by the number of studies that described it, occurred in manta rays and devil rays, followed by basking sharks and then by eagle rays and cownose rays. However, many other species of sharks, as well as sawfishes and stingrays, also perform this behavior. A breaching white shark surprises researchers off Cape Cod, Massachusetts. Why it matters It takes a lot of ene...

The Steller’s sea eagle is one of the largest and most aggressive raptors in the world. With an 8-foot wingspan and striking white markings, these birds tower over their bald eagle cousins. Steller’s are sublime, but they aren’t beautiful in the way people often sentimentalize animals. Most adult Steller’s survived by beating their weaker sibling to death in the nest within weeks of birth and were rewarded for their aggression by nurturing parents. No wonder they can fight off brown bears and hunt on the sea ice of the Russian Arctic. Since mid-2020, one individual Steller’s sea eagle has drawn national media attention because of the vast distances it has traveled – from Russia’s Kamchatka Peninsula to Alaska, then to Texas, eastern Canada, New England, and most recently, a reported sighting on May 2, 2023 in Newfoundland – and the extreme lengths to which birders are going to glimpse it. Biologists have learned remarkable th...

As recently as 50 years ago, the pit bull was America’s favorite dog. Pit bulls were everywhere. They were popular in advertising and used to promote the joys of pet-and-human friendship. Nipper on the RCA Victor label, Pete the Pup in the “Our Gang” comedy short films, and the flag-wrapped dog on a classic World War I poster all were pit bulls. With National Pit Bull Awareness Day being celebrated on Oct. 28, 2023, it’s a fitting time to ask how these dogs came to be seen as a dangerous threat. Starting around 1990, multiple features of American life converged to inspire widespread bans that made pit bulls outlaws, called “four-legged guns” or “lethal weapons.” The drivers included some dog attacks, excessive parental caution, fearful insurance companies and a tie to the sport of dog fighting. As a professor of humanities and law, I have studied the legal history of slaves, vagrants, criminals, terror suspects and others deemed...