The largest rodent

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It is the capybara (Hydrochoerus hydrochaeris), also known as chigüire, chigüiro or carpincho. It can measure 50-60 cm high and 1.3 m long and can weigh… more than 50 kg! This species lives exclusively in South America. It lives in more or less numerous groups in the vicinity of watercourses. A curious feature is that … Read moreThe largest rodent

Invasive alien species. They have come… to stay

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Asian hornet, raccoon, water hyacinth, red swamp crayfish, red-eared slider, monk parakeet, fountain grass, red palm weevil, wels catfish, Xyllela fastidiosa… They are all names of organisms that increasingly dominate the headlines of the major media in various countries. They are a real problem in many ways. The environment, the economy and the health system … Read moreInvasive alien species. They have come… to stay

An egg sack to take care of the offspring

The spider Agroeca brunnea makes a simple-looking egg sac and usually attaches it to an elevated site. But the curious thing is that it is bicameral, composed by the chamber of the eggs (1) and the chamber of molt (2). Eggs hatch in chamber 1 and newborn spiders pierce the cover plate, falling into chamber … Read moreAn egg sack to take care of the offspring

The orangutans’ “trick” to ensure their reproductive success

Orangutan females reach sexual maturity at 11-15 years. Males reach puberty at 7-9 years and thereafter they have 2 possibilities : 1.Reach adult size with all its features (such as lateral facial pads -green arrow-). 2.Stay in an adolescent state (development interrupted) in terms of morphology, but still are fertile and reproductively active. Possible meaning? … Read moreThe orangutans’ “trick” to ensure their reproductive success

How does the ogre-faced spider hunt?

These spiders of the genus Deinopis are weavers, but the web they manufacture consists of a few threads attached to the front legs. When prey (e.g. a moth) approaches, the spider separates the legs, extends the spiral and rushes over it to catch it. They’re called “ogre-faced” because of the “face” of the prosoma. They … Read moreHow does the ogre-faced spider hunt?

Orangutans, the mammals that take the longest to have a calf

The intergenesic interval (the time from one birth to a potential next pregnancy.) of orangutans is the largest of all primates and mammals: 6-8 years. During all this time the offspring are very dependent on the mother because they need a long learning period in order to survive on their own. For instance, they learn … Read moreOrangutans, the mammals that take the longest to have a calf

The hearing of snakes

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Snakes don’t have eardrums… HOW DO THEY HEAR THEN? What happens is that the lower jaw is connected to the columella (homologus organ to the mammalian stapes), a bone that connects to the oval membrane, which in turn connects to the inner ear. In this way, being in contact with the ground or water, the … Read moreThe hearing of snakes

An aquatic spider?

It is Argyroneta aquatica. This spider not only dive, but completes its entire life cycle underwater. How does it breathe? It produces an air bubble that envelops the opisthosoma (the “body” without the “head”). As the bubble consumes, the spider comes to the surface to add other bubbles and increase its supply of air. How … Read moreAn aquatic spider?

How do amphibians hear?

Amphibians have two ways to capture the vibrations of the medium and transform them into sound: In one hand, through their legs… What actually happens is that when the ground vibrates, vibrations are transmitted by the legs to the scapula of these animals, and  through the opercular muscle and opercular bone, reaching the oval membrane … Read moreHow do amphibians hear?

Scorpions also shine

Scorpions emit fluorescence…when they are illuminated with ultraviolet light. It is supposed to be a kind of warning. The same happens with centipedes. In biology this phenomenon is called aposematism, that is, warning mechanisms to indicate that they are dangerous. There are several types of aposematism, especially in relation to color (intense colors such as … Read moreScorpions also shine

Syrphids. Camouflaged as wasps

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Surely, many of you have seen these animals flutter in the field… And surely many of you have turned away when you saw them nearby and shouted: “Watch out, a wasp!” Well, they’re actually flies… yes, harmless FLIES known as syrphid flies, flower flies or hoverflies. They imitate the coloration of wasps, which warns of … Read moreSyrphids. Camouflaged as wasps

Cobwebs: Architecture in miniature

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There are up to 7 types of silk-producing glands (and each silk is different). But not all spiders have all those glands. Not all the spiders build cobwebs, but all of them have the ability to produce silk. The construction of cobwebs is genetically codified, it is not by learning. In addition, it is done … Read moreCobwebs: Architecture in miniature

Behavior manipulators. The organisms capable of breaking the will

Behavioral control has always aroused deep fears. For instance, the mere idea of the existence of institutions and projects that have tried to manipulate the most private and apparently untouchable aspects of an individual arouses evident uneasiness. However, human being is not pioneer in behavioral control techniques. In nature, several species have been practicing these … Read moreBehavior manipulators. The organisms capable of breaking the will