Balaenoptera musculus
Silhouette: Chris huh · PhyloPic
In 3 days ~10% in a week ~30%
The blue whale (Balaenoptera musculus) is a species of baleen whale and the largest marine mammal in the rorqual family Balaenopteridae. Reaching a maximum confirmed length of 29.9–30.5 m (98–100 ft) and weighing up to 190–200 t (190–200 long tons; 210–220 short tons), it is the largest animal known to have ever existed. The blue whale's long and slender body can be of various shades of greyish-blue on its upper surface and somewhat lighter underneath. There is a population in the waters off Chile that may constitute a fifth subspecies.
In general, blue whale populations migrate between their summer feeding areas near the poles and their winter breeding grounds near the tropics. There is also evidence of year-round residencies, and partial or age- and sex-based migration. Blue whales are filter feeders; their diet consists almost exclusively of krill. They are generally solitary or gather in small groups, and have no well-defined social structure other than mother–calf bonds. Blue whales vocalize, with a fundamental frequency ranging from 8 to 25 Hz; their vocalizations may vary by region, season, behavior, and time of day.
The blue whale was abundant in nearly all the Earth's oceans until the end of the 19th century. It was hunted almost to the point of extinction by whalers until the International Whaling Commission banned all blue whale hunting in 1966. The International Union for Conservation of Nature has listed blue whales as endangered as of 2018. Blue whales continue to face numerous man-made threats such as ship strikes, pollution, ocean noise, and climate change. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bahía de Loreto National Park | 🇲🇽 Mexico | |
| 2 | Svalbard | 🇳🇴 Norway | |
| 3 | Channel Islands National Park | 🇺🇸 United States | |
| 4 | Galápagos Islands | 🇪🇨 Ecuador |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Ostrava Zoo | 🇨🇿 Czechia |
Rare
Under 5% of wildlife watchers report a Blue Whale sighting in Galápagos Islands on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 12 mammals we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
July–August and October
In those months about 10% of wildlife watchers report a Blue Whale in Galápagos Islands on a given day, against under 5% in September and November–June, the lowest months. Those are among Galápagos Islands's driest months, with almost no rain against 50 mm in March.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Blue Whale sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Blue Whale sightings, Galápagos Islands ranks 4th at under 5%. The best odds are in Bahía de Loreto National Park (Mexico, about 30%), Svalbard (Norway, about 20%) and Channel Islands National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Blue Whale is recorded against all the mammals logged in Galápagos Islands (11 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
