Animal A Day!

AaD is taking a holiday break. See you all back in January!

Balaenoptera acutorostrata The Common Minke Whale is one of the most abundant whale species on the planet-- there are believed to be around 800,000 of them! They also happen to be the smallest of the Rorquals (baleen whales with throat grooves), and reach only 30ft in length. Common Minke Whales are found in ocean waters worldwide. They usually swim alone, though sometimes pairs or very small groups are observed. Their small size helps to identify them, as does their slim, sleek body, cloudy-grey skin, white fin bands, and double blowhole. Like all Baleen Whales, the Common Minke feeds on very small fish and invertebrates, filtering their prey through the baleen plates that hang in their mouths. Because of their abundance, Minke Whales are common targets for human interaction. They are frequent stars of whale watching tours, but they are also hunted by whalers as well. In the past, Minke Whales were not popular whaling targets because of their small size. However, most larger...

Camelus dromedarius Did you know that the Dromedary Camel was domesticated 4,000 years ago? There are around 13 million of these beasts of burden living around the world-- most notably in Africa, the Middle East, and in the deserts of Australia. Most of these camels are either living as domesticated creatures, or they are surviving in feral populations. Australia, for example, had several thousand camels imported during the late 19th and early 20th century. Today there are nearly a million living in feral groups across the dry western half of the continent. These feral groups live in herds of around 20 individuals, though much larger packs have also been observed. The Camels feed on whatever vegetation they can find, including prickly, thorny plants. Dromedary Camels are well suited to desert life. Their single hump can store up to 80lbs of fat, which converts to energy when food or water is unavailable. They are masters of co nserving their energy, and can travel over 100 mil...

Haliphron atlanticus The Seven-arm Octopus has a misleading name. They do actually have eight arms, like all Octopuses do, it's just that one of the arms (the hectocotylus, used for egg fertilization) is often curled up on the males' bodies, making it difficult to see. Females of the species do that have that issue. Seven-arm Octopuses live in both the Atlantic and the Pacific oceans. It was believed to live only in the former until about fifteen years ago, when one was caught off the coast of New Zealand. Interestingly, these creatures have also been found at both the sea floor AND near the surface, which is unusual for Octopuses. The species is also notable because they are quite large. In fact, they are the largest Octopuses in the world, and can measure over 11ft in length! IUCN Status : Not Listed Location : Atlantic and Pacific Oceans Size : Length up to 11ft (3.5m) Classification :  Phylum : Mollusca -- Class : Cephalopoda -- Order : Octopoda Family : ...

Tetracerus quadricornis The Four-horned Antelope is named for the four permanent horns that are found on the males' skulls. That trait actually makes them unique among living mammals. yes, there are some breeds of sheep that have multiples horns, but those are not guaranteed. The male Four-horned Antelope always has that number! These Antelope are also interesting because of their small size-- they stand less than 2ft tall, which makes them the smallest Bovids in Asia. When it comes to behavior, the Four-horned Antelope is a solitary creature that feeds on fruits, leaves, and flowers. Males and females remain apart until the breeding season, where the sexes will perform courtship rituals like kneeling and strutting in order to select mates. The gestation period lasts about 8 months, after which one or two young are born. The offspring remain with their mother for about a year, and reach sexual maturity themselves at about 2 years of age. The species is found in only two c...

Aquila fasciata The Bonelli's Eagle is named for 19th century Italian Ornithologist Franco Andrea Bonelli. It is a large bird, with a body length of around 2ft, and can be found in southern Europe, southern Asia, and throughout most of Africa. These Eagles are identified by their brown upper-parts, dark-streaked white under-sides, and by the black band at the end of their tail. Adults and juveniles can be told apart by that band-- Juveniles don't have it. Another way to know a Bonelli's Eagle is near? Their call! They make a klu-klu-klu-klee  sound while near the nest. Bonelli's Eagles prefer to live in areas that are neither too open, nor too dense with trees. They typically hunt from trees, swooping down on ground-dwelling prey when spotted. Birds and Lagomorphs are their most common targets. Did you know that many species of Eagle build multiple nests at a time? The Bonelli's Eagle is one of those species. Pairs mate for life, and will build as many a...

Anomalocaris Anomalocaris is the name of a genus that lived during the Cambrian period... over half a billion  years ago! These ancient relatives to the arthropods of old swam in the seas that covered the planet. Their fossils have been found in places that are (now) as far apart as Canada, China, and Australia. Anomalocaris grew up to 3ft in length, and had a segmented body that allowed it to swim using an undulating motion. They also had complex, stalked eyes, and two arms covered in barbs that extended from the mouth. The mouth itself was circular, and may have been able to crush hard-bodied prey like Trilobites. The interesting anatomical features of Anomalocaris made it difficult to identify for many, many years. Different body parts were found independent from one another, and were actually attributed to several different animals, including Jellyfish and Crustaceans. While the first fossils were discovered in 1892, it took until 1985 for scientists to realize all of...

Coryphaenoides armatus Today's animal is one of those deep sea fish that we so uncommonly see alive. Even though they live in all of the world's oceans, the Abyssal Grenadiers normally hang out between 1,000 and 15,000  feet down! These fish are abundant in the dark depths of the oceans. As adults they can grow nearly a meter in length, though smaller sizes are more common. They feed on other fish, sea urchins, crustaceans, and cephalopods. Abyssal Grenadiers have a very distinct look to them. They have large heads (featuring large eyes) but bodies that taper out into a tail that completely lacks a caudal fin, along with spined fins that run down both their dorsal and central sides. These fish are known to be very slow-growing, and live as long as 60 years. Amazingly, while many fish species are suffering, the Abyssal Grenadier populations are booming! They live so far down that they aren't affected by the fishing industry, and between 1989 and 2004 they doubled i...

Limnodynastes interioris The Giant Banjo Frog, also known as the Great Bullfrog, is an amphibian found in Southern Australia. At a body length of around 9cm, it is the largest Frog in Victoria. As adults, Giant Banjo Frogs spend most of their time in underground burrows that they dig, keeping themselves moist by absorbing water from the soil around them. They typically are only seen at the surface after it rains, which is when they spawn and hunt for food. During the wet season, the male Frogs will make fast, low pitched calls in order to attract mates. The Giant Banjo Frogs do their spawning in smaller, slower moving bodies of water like ponds and marshes. They will even lay them in flooded burrows! As Tadpoles they stay in those still or slow-moving zones, maturing slowly before metamorphosing and reaching sexual maturity around 2-3 years of age. IUCN Status : Least Concern Location : Australia Size : Length up to 3.5in (9cm) Classification :  Phylum : Chordata --...

Oreamnos americanus The Mountain Goat is a large ungulate found only in North America. They are the only species in their genus, but belong to the same subfamily as True Goats and Sheep, Musk Oxen, and Takin. Mountain Goats live in the Rocky and Cascade Mountains, and they are the largest animals (in their range) to live above the tree line. Males can weigh over 300lbs, while females are usually 2/3 the size. Despite their large size, the Mountain Goats are very good climbers. Their cloven hooves spread apart for balance, and their footpads help them to maintain traction while traversing areas that have up to 60 degrees of incline. They can also jump up to 12feet in a single leap! Aside from the size, male and female mountain goats look like-- stark white fut with short beards and black horns. Males live alone most of the time, while females live in small herds with other females and their offspring. Kids are born during the Spring months, and because of the lack of ground co...

Siren lacertina While it looks like an Eel, today's animal is actually an amphibian-- related to frogs, toads, and salamanders. The Greater Siren is its common name, and it is one of three water-living, practically leg-less Siren species. The legs are  there, but they are very, very small, and can sometimes be totally obscured by the large external gills that these creature have. These creatures are typically brown or black, and have faint stripes as juveniles (though they lose them over time). Greater Sirens are some of the largest Amphibians found in North America-- they can grow up to 1m in length! They are found in the freshwater rivers and lakes of the southeast United States, where they hunt crayfish, small fish, snails, and other aquatic invertebrates. The reproductive habits of these Amphibians is unknown. Mating has never been observed! They don't have the organs that typically go along with internal fertilization, but they lay their eggs like an internally f...

The Florida Gar is a large freshwater fish found in the waters of the southern United States, especially in Florida and Georgia. They can grow to lengths of 3-4ft, and can be identified by their blotchy dark spots that cover the body and fins. Florida Gars are able to live in shallow waters that have very little oxygen. They have a special organ, called an air bladder, that allows them to breathe air. You'll find these fish living in small groups that number between 2 and 10 individuals. They breed in the early spring during a large spawning events where the females lay sticky eggs in the aquatic vegetation and males swim over them and release sperm to fertilize. The parents have no more involvement with the eggs after the spawning event. As juveniles, Florida Gars feed on insect larvae, plankton, and very small fish. As they grow up they move to larger fish and invertebrates. The Gars hunt by stalking prey very slowly, and then lunging with inedible speed and catching the vi...

Taphozous mauritianus Though named for the island of Mauritius, the Mauritian Tomb Bat is found throughout sub-Saharan Africa and Madagascar. They live in open habitats, including dry-scrub areas where there is little moisture, though they prefer areas with more rainfall. Outside of the mating season, these bats live in small groups that roost together in cavers, tree cavities, and even on buildings. During the breeding season females roost together in larger groups (several dozen), while males are typically alone. They typically mate once per year, though some populations (depending on location) will make twice. The Bats are polygamous, and males take no part in raising their offspring. Mauritian Tomb Bats can be identified by their completely white undersides and mottled-gray backs. They have long, narrow arms, and their wingspan is close to double their body length (about 21cm as opposed to 10-11cm). As with other bats, the Mauritian Tomb Bats use echolocation to hunt at n...

Ceryle rudis The Pied Kingfisher is one of the most common Kingfishers in the world. You'll find them throughout sub-Saharan Africa and Asia, where they live in lowland regions near bodies of water. Pied Kingfishers are very distinctive in appearance. They have white faces with black masks, stark black bills, and patchy (pied) white and black feathers on their crest, back, and wings. Males and females differ in their chest bands-- males have two, females only one. Fish are the primary prey of the Pied Kingfisher, though aquatic insects and crustaceans will also be consumed. They hunt by hovering over the water, and once they spot prey they dive in with their large bill first and snatch it up. They can swallow small fish whole, which allows them to hunt longer (rather than returning to a nest to feed). Pied Kingfishers do their nesting in holes that they dig out in vertical sandbanks. These holes can be more than 4ft long, and can take up to a month to excavate. As many as...

Canis lupus baileyi The Mexican Wolf is a subspecies of Grey Wolf-- and the most rare subspecies at that. They are listed as Critically Endangered. On top of being close to extinction, they are the smallest (about the size of a German Shepherd), most genetically distinct, and the most southern-living of the North American grey wolves. Mexican Wolves used to have a range that spread across northern Mexico and the southwest United States. Over time, the large prey mammals that the wolves hunted became more rare, and so the wolves turned to livestock, resulting in widespread wolf hunting. By the 1970s they were extinct in the wild. Today there are about 75 Mexican Wolves in Arizona, placed there as part of a reintroduction project that began in 1998. The population has been growing, but very slowly. In addition to those wolves, there are about 300 individuals in captivity, with 47 breeding facilities. Unfortunately those reintroduced Wolves are being hunted, with two shot illega...