AnimaliaHighest rank in taxonomy. Groups all life into domains: Animalia, Plantae, Fungi, etc.IUCN LCInternational Union for Conservation of Nature — the world authority on species extinction risk, using standardized criteria. — Least Concern — widespread and abundant; not at immediate risk of extinction.In ProgressCurrent stage of this record in the editorial review workflow. Recent Sighting
Balaenoptera edeni
Bryde's Whale
Anderson, 1879
Detailed Texts Multi-lang
Bryde's whale (Balaenoptera edeni) is a medium to large-sized mysticete (baleen whale) with an extremely hydrodynamic, slender body that is dark smoky gray on the back, becoming lighter on the belly. Its most unmistakable anatomical feature, distinguishing it from any other rorqual species in the world, is the presence of three prominent longitudinal ridges on the top of its head (the rostrum), running from the blowhole to the tip of the snout (other whales only have one central ridge). It has a strongly falcate (sickle-shaped) dorsal fin located far back on its body. Unlike humpbacks, it rarely flukes up (raises its tail) when diving, and its blow is relatively low and thin. It is an agile and fast hunter of tropical waters.
Added by
Anonymous Curator
Reviewed by
Under Review
Last modified by
Julia Trouin
TaxonomyBiological classification ranks placing this species within the tree of life, from Kingdom down to Genus.
PhylumRank below Kingdom. Groups organisms sharing a fundamental body plan (e.g., Chordata = vertebrates and some invertebrates).Chordata
ClassRank below Phylum. Subdivides by structural traits (e.g., Mammalia, Aves, Reptilia, Insecta).Mammalia
OrderRank below Class. Groups related families sharing common ancestry (e.g., Carnivora, Primates).Cetartiodactyla
FamilyRank below Order. Groups closely related genera (e.g., Felidae = cats, Canidae = dogs).Balaenopteridae
GenusRank just above Species. The first word in the two-part binomial scientific name.Balaenoptera
Taxonomic AuthorityThe scientist who first formally described and published this species, followed by the year of publication.Anderson, 1879
Record Completeness
85%Coming soon
Ecology & StatusHow this species lives: habitat preferences, diet, behavior, population status, and role in its ecosystem.
OriginWhether the species is native (evolved here), endemic (found only here), or introduced by human activity.
Native
Population TrendDirection of change in population size over time: increasing, stable, decreasing, or unknown.
Unknown
Breeding SeasonTime of year when this species typically reproduces or flowers.
Year Round
Trophic RolePosition in the food chain: producer, herbivore, carnivore, omnivore, decomposer, or parasite.
Carnivore
Recent SightingsWhether this species has been observed in the wild in Costa Rica within recent years.
Yes
Habitat SummaryOverview of the specific ecosystems and environments where this species is found in Costa Rica. Multi-lang
It is the only baleen whale that spends its entire life in tropical and subtropical waters (between 40°N and 40°S). It does not undertake long migrations to the poles to feed like other large whales do. In Costa Rica, it is a resident species and can be observed year-round, being especially common in the South Pacific, in coastal and pelagic zones of the Golfo Dulce, the Osa Peninsula, and the Costa Rica Thermal Dome, where nutrient abundance attracts its prey.BehaviourDaily activity patterns, movement, territory use, foraging style, and seasonal behavioral changes. Multi-lang
They are usually solitary whales or found in pairs (especially mothers with calves), although loose aggregations can form in areas with abundant food. Their swimming can reach 20-25 km/h. They do not raise their tail flukes when diving; instead, they arch their back sharply and disappear. They make relatively short dives, of 5 to 15 minutes, to hunt in the epipelagic layer. They often associate with tunas, dolphins, and seabirds that corral fish at the surface.Social ActivitySocial structure: whether the species is solitary, paired, or colonial; hierarchy and communication. Multi-lang
Not very social. Mainly solitary. They only form small temporary groups in areas with high food concentration or females with their nursing calves.Feeding GuildWhat the species eats, how it forages or hunts, and its role as a consumer in the food web. Multi-lang
Carnivore / Planktivore / Piscivore (Filter feeder).Trophic Chain DetailsSpecific interactions in local food webs: prey species, predators, competitors, and scavengers. Multi-lang
Pelagic filter-predator. Feeds on krill, copepods, but especially on small pelagic fish (sardines, mackerel, anchovies). Occasionally, calves or weak individuals may be attacked by large pods of Killer Whales (Orcinus orca) or large pelagic sharks.Reproductive BehaviourMating strategies, courtship displays, nesting or spawning behavior, and parental care. Multi-lang
Lacking marked polar migrations, they can breed and calve year-round, although regional peaks may exist. The gestation period lasts between 11 and 12 months. A single calf is born, measuring about 4 meters in length and weighing nearly a ton. The calf is nursed for approximately 6 months on extremely fat-rich milk before being weaned and separating from its mother.Physical Measures
Length (cm)
1150.0 - 1500.0 cm
Weight (Grams)
12000.00 kg - 25000.00 kg
Offspring per cycleTypical number of young (live births, eggs, or seeds) produced by one adult in a single reproductive event or breeding season.1 - 1
Sexual DimorphismObservable physical differences between males and females of the same species (e.g., size, coloration, features).Yes
Lifespan
Sexual MaturityAge at which the individual becomes capable of reproducing for the first time.
96 - 132 Months
Gestation / IncubationDuration from fertilization to birth (mammals) or to hatching (egg-laying species).
330 - 365
Lifespan EstimatedExpected duration of life from birth to natural death under wild conditions.
Males40 - 60 Years
Females40 - 70 Years
Sexual DimorphismPhysical differences in size, coloration, or morphology between males and females of this species.
Males Multi-lang
Adult males are usually slightly smaller than females.
Females Multi-lang
Females are larger (common dimorphism in baleen whales) to support the immense energetic demands of gestation and lactation.
Evolutionary AdaptationsInherited traits and behaviors that improve the species' survival and reproduction in its specific environment. Multi-lang
The Three Ridges (Hydrodynamic Sensor): Although their exact function is under study, it is believed that the three rostral ridges act as hydrodynamic sensors that help it detect fine changes in water pressure and track evasive schools of fish while swimming at high speed.
Lunge Feeding: It has between 40 and 70 ventral pleats (gular grooves) that expand like an accordion. Upon finding a school of sardines or krill, it suddenly accelerates, opens its huge jaws, and engulfs tons of water and prey, then pushes the water out through its coarse baleen plates, retaining the food.
Main ThreatsDocumented pressures reducing the population: habitat loss, hunting, disease, climate change, and invasive species. Multi-lang
Ship Strikes: Because they spend a lot of time near the surface in coastal and international shipping lanes, they have a high risk of being killed or severely injured by the propellers and hulls of large merchant ships.
Underwater Noise: Engine noise and seismic explorations interfere with their low-frequency communication and alter their feeding and socializing patterns.
Interesting FactsSurprising or notable facts that highlight what makes this species unique or ecologically important. Multi-lang
Schooling Fish Hunters: While many baleen whales feed almost exclusively on zooplankton and krill, Bryde's whale has a highly fish-based diet (piscivorous). It is common to see it aggressively lunging through 'baitballs' of sardines and anchovies.
Erratic Behavior: They are known for their unpredictable swimming behavior. They change direction sharply underwater and sometimes surface unexpectedly at a different angle than they dove, making them difficult for researchers to track.