Articles tagged with Whales
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Researchers have discovered that Araguaian river dolphins use hundreds of different sounds to communicate with each other, including short calls for mother-child interaction and longer whistles for maintaining distance. The unique acoustic characteristics of these sounds may have evolved to avoid echoes in their aquatic habitat.
Researchers have uncovered an ancient four-legged whale named Peregocetus pacificus, dated to 42.6 million years ago, with a mix of terrestrial and aquatic adaptations. The discovery supports the hypothesis that early cetaceans migrated from Africa to South America across the South Atlantic.
A new study reveals that fossilized barnacles can serve as a proxy for the migrations of whales in the distant past. Oxygen isotope ratios in barnacle shells change with ocean conditions, allowing scientists to chart the migration routes of whales.
Scientists used fossil and modern whale barnacles to reconstruct the movements of ancient humpback and grey whales. The study found that summer-breeding and winter-feeding migrations have been a consistent part of these whales' way of life for hundreds of thousands of years.
Researchers analyzed oxygen isotope signatures from whale barnacle shells to reconstruct ancient migration patterns. The study found consistent seasonal variations in oxygen isotopes, mirroring modern whale migration patterns and suggesting that baleen whales have retained their migratory routes for over 270,000 years.
A study of a single male narwhal found that it spends over half its time diving to depths of over 700m in search of halibut, cod, and squid. The whale can also last for several days without eating, using stored energy reserves.
An international team of scientists discovered a new species of killer whale, Type D, off the coast of Cape Horn, Chile. Genetic samples collected will help determine whether this animal is indeed new to science.
A recent study reveals that sonar disturbs the feeding behavior of blue whales, especially in deep patches of krill. The researchers tracked the whales' movements using suction tags and found that they stop feeding when sonar signals are present, but often resume soon after.
Researchers found that blue whales' migration patterns are driven by the timing of spring phytoplankton blooms and their ability to remember stable foraging sites. This allows them to optimize food tracking and forage in areas with higher long-term productivity.
Researchers found that blue whales align their migration timing with historical averages of krill production, rather than responding to current prey patches. This suggests that blue whales rely on memory to locate stable, high-quality foraging sites, which could make adaptation to climate change more difficult.
A new study reveals Cuvier's beaked whales dive up to 1,400 meters, lasting about an hour, with brief recovery times. The findings provide a baseline for studying their reactions to sonar and offer insights into the species' remarkable diving capability.
Researchers monitored southern resident killer whale population and found that males dive deeper and are more successful hunters than females. The team tracked the animals' movements and diving patterns using archival tags to estimate how much fish they capture, revealing sex differences in foraging activity.
Researchers found that beaked whales prefer areas with dense patches of deep-sea squid, which are essential for their survival. In contrast, nearby sonar-free areas lack these prey hotspots, making it difficult for the whales to obtain enough food to survive.
Researchers discovered that humpback whales singing at subarctic feeding areas produce complex, progressive songs similar to those found at tropical breeding grounds. The study suggests that these whales may be capable of opportunistic mating and song exchange in overwintering sites.
A study by Otago researcher Dr Carolina Loch and colleagues has shed new light on the evolution of modern baleen whales' ancestors, revealing complex enamel structures in their teeth. The research suggests that these ancestral whales had a mix of mammalian and whale-like characteristics.
A new health check has been developed to discover the diets, migrations, and conservation needs of whale sharks. The research revealed that some whale sharks may have gone weeks or months without eating, and surprisingly, all tested showed signs of eating plants and algae.
Researchers have discovered that fin whales may live in the Gulf of California year-round, with a resident population estimated to be between 100 and 700 individuals. The study suggests that the gulf provides an ideal habitat for the whales, allowing them to exploit a rich food source and potentially breed and calve.
The stomach contents of Basilosaurus isis suggest it preyed upon smaller whales like Dorudon atrox. Fish remains also indicate that the ancient whale actively hunted its prey rather than scavenging.
Researchers found that humpback whale populations in the South Atlantic and Indian Oceans share similar song types, with males from different populations coming into contact to learn songs from each other. Over time, shared phrases and themes emerged, with similarities detected across years.
A study by Woods Hole Oceanographic Institution found that short-finned pilot whales off the coast of Hawai'i have distinct vocal dialects. The discovery may help researchers better understand the whales' social behavior and conservation needs.
Scientists have discovered that humpback whales retain tooth germs until late in gestation, a surprising finding that sheds new light on the evolutionary transformation of these marine mammals. This discovery was made possible by advanced CT scanning technology and provides valuable insights into the development of whale anatomy.
A new study reveals degradation of local coral reef ecosystem in Tan-awan, Oslob, due to intensive whale shark tourism. The research highlights the need for proper management strategies to mitigate reef degradation and promote sustainable tourism.
A 180-million-year-old ichthyosaur fossil has yielded surprisingly well-preserved soft tissues, including skin that retains some of its original pliability. The study reveals the presence of blubber under the skin, similar to modern whales and sea turtles.
A 33-million-year-old fossil whale named Maiabalaena from Oregon had neither teeth nor baleen, challenging previous assumptions about the evolutionary origin of these structures. The discovery provides new insights into the feeding habits of early whales and sheds light on the complex evolution of whale species.
Scientists have discovered an ancient whale that lacked teeth and baleen, revealing a surprising intermediate step in the evolution of this innovative feeding strategy. The newly described fossil, Maiabalaena nesbittae, lived about 33 million years ago and likely had strong cheeks and a retractable tongue.
Baleen whales experienced chronic stress from whaling, ship noise, and sea-surface temperature changes over nearly 150 years. Cortisol levels peaked in the 1960s during whaling's peak and remained high after WWII, indicating a persistent impact of human activities.
Researchers discovered the hierarchical structure of whale baleen contributes to its unique fracture behavior. The nanoscale structure increases stiffness and strength, while microscale tubular lamellae control crack propagation, making it an ideal material for marine applications.
Researchers analyzed 24 captive killer whales' personality traits using the five-factor model, finding similarities with both humans and chimpanzees. The study suggests that complex social interactions may require certain personality traits.
Whales and dolphins use a narrow beam of high intensity sound to find food in dark or murky waters; size affects the ability to focus this sense.
Humpback whales have been observed feeding on krill in the Mediterranean, with experts predicting an increase in sightings due to changes in climate and temperature. The species migrates from the poles to the Equator to reproduce, and recent studies suggest that food availability is a key factor in their presence in the region.
Researchers found that preserving the lives of adult females in the North Atlantic right whale population is crucial for promoting population growth and recovery. Most deaths are attributed to entanglement in fishing gear and collisions with ships, highlighting the need for conservation efforts to protect these animals.
Researchers analyzed rake marks on over 3000 humpback whale tails and found that attacks by orcas are on the rise. The study suggests that young whales are primary targets, with scarred females showing a higher reproductive success rate.
The Orcasound project has developed a web application that enables citizen scientists to listen to livestreaming audio from hydrophones, complementing computer algorithms in analyzing data. The app aims to bring synergy between human listeners and sophisticated algorithms, saving audio data to online cloud storage for later analysis.
Researchers have successfully detected and described four whale species using detailed satellite imagery, providing a cost-effective method for monitoring population changes and behavior. The study identifies key inaccessible whale populations that can benefit from satellite-based tracking.
Researchers studied 34 right whale mother-calf pairs from 2011 to 2015, discovering that near-surface resting behavior increases the risk of ship strikes and low call-rates may be a defense mechanism. The study's findings emphasize the need for improved protection measures to prevent extinction
A study found that male humpback whales reduce or cease singing in areas with high human shipping noise. The authors suggest that ceasing vocalization and moving away may be cost-effective adaptations to avoid the noise.
University of Cincinnati biology professor Takuya Konishi proposes that mosasaurs hunted like killer whales by ramming their prey with their snouts. The young Tylosaurus mosasaur found in Kansas had a similar facial structure to orcas, with a protruding snout and robust cranial vault.
A new study found that while polar bears relied on whale carcasses in the past, this resource will not be enough to sustain most bear populations in the future due to climate change. The Arctic is expected to become ice-free by 2040, making it difficult for bears to find alternative food sources.
A new study models the impact of PCBs on killer whale populations, finding that high concentrations in key regions could lead to collapse within a century. The model simulates accumulation and transfer of the chemical to offspring, tying population size and sustainability to proximity to PCB production.
A new study published in the journal Science reveals that killer whale populations are severely affected by PCBs, with over half of studied populations showing significant declines. The research predicts that these populations may disappear within 30-50 years if current levels of pollution persist.
The Northeast Canyons and Seamounts Marine National Monument is a critical hotspot of biodiversity, with an aerial survey revealing over 600 animal sightings in just four hours. The monument's protected resource status is under review by the Trump administration.
Researchers discovered that beluga whales and narwhals undergo menopause, mirroring killer whales' behavior. This reproductive strategy may have evolved due to increased relatedness among family members and the need for older females to contribute to group survival through knowledge sharing.
Humpback whale songs may be used for echolocation, allowing singers to analyze their surroundings and locate other whales. This challenges the long-held assumption that whale songs are primarily used for reproductive purposes, instead suggesting a more complex cognitive process at play.
A new study tracked juvenile whale sharks across the Philippines, emphasizing the importance of the archipelago for the species. The study found that all tagged whale sharks stayed within the Philippines, with one individual traveling over 2,500 km through the Sulu and Bohol Seas.
Researchers successfully quantify hormone levels in whale breath for the first time, providing a new non-invasive method to study whale health. The technique allows for rapid and short-term acute responses to stressors, such as entanglement hazards and vessel strikes.
Researchers recorded narwhals in East Greenland, capturing six hours of audio that revealed three types of sounds: clicks, buzzes, and calls. The study found that narwhals produce buzzes at greater depths than clicks, and that a particular fjord had high buzzing rates, suggesting a preferred feeding area.
Researchers from Uppsala University have discovered evidence of large-scale whaling in north Scandinavia dating back to the mid-6th century CE. The production of whalebone gaming pieces reveals a regular supply of whalebone was needed, indicating extensive whaling practices.
Researchers discovered that pilot whales and Risso's dolphins can recognize the alarming calls of killer whales, leading to evasive actions such as fleeing. The team found unique features in the distressing calls that are not present in other whale species or human screams, suggesting a warning system for potential victims.
A new study urges a more proactive conservation management strategy for North Atlantic right whales due to declining calf births and shifting distribution. Researchers recommend expanding protective policies to cover their new habitat range and implementing advanced monitoring programs.
The study found that whale sharks congregate at specific locations with unique characteristics, such as steep slopes and upwelling of plankton and krill. These areas provide ideal conditions for the filter-feeding sharks to search for food in deep water and warm shallows.
Researchers developed a novel hormone analysis technique to measure the effects of fishing gear entanglement on North Atlantic right whales. The study found that entanglement can cause severe stress responses, starvation, and changes in migration patterns.
A new study found that blue whales frequenting the South Taranaki Bight in New Zealand are part of a locally distinct population. Researchers used hydrophones and biopsies to determine genetic differences, estimating a minimum abundance of 718 individuals.
Scientists documented dozens of dolphins and pilot whales, as well as rare Sowerby's beaked whales, endangered sperm whales, and giant ocean sunfish. The aerial survey revealed an incredible abundance of marine life in the Northeast Canyons and Seamounts Marine National Monument.
A 34-million-year-old fossil discovery in Antarctica has provided significant insights into the evolution of baleen whales. The ancient whale, Llanocetus denticrenatus, had well-developed teeth and gums instead of baleen, suggesting a transition from biting to filter feeding occurred over time.
A 34-million-year-old whale skull from Antarctica reveals early whales didn't have baleen, but instead used teeth to bite large prey. The discovery provides a rare window into the earliest phase of filter feeding evolution.
Researchers tracked a female whale shark's 20,142 km migration from eastern Pacific to western Indo-Pacific, the longest recorded migration. The study provides new insights into whale shark migration patterns and conservation efforts.
A new genetic analysis reveals that two male whales fathered over half of the calves born since 1990, indicating inbreeding in the Southern Resident killer whale population. The limited breeding number reduces the population's resilience to change, potentially compromising individual animals' survival.
Researchers used a rocket scanner to take the first whole-body CT scan of a minke whale, revealing insights on whale communication. The team modeled how whales hear low-frequency sounds using custom-developed computer simulation tools.
A new study has found that researchers can detect killer whales in Puget Sound by analyzing environmental DNA (eDNA) in water samples. The eDNA persists for up to two hours after the whales have passed through, providing a potential game-changing advance in whale tracking and identification.
A large group of common bottlenose dolphins was recorded in Canadian Pacific waters, the first confirmed occurrence in this area. The sighting suggests that these warm-water species may naturally range into British Columbia, Canada when conditions are suitable due to warming trend.