Animals

Tuesday, 10 November 2026
15 facts about fleas
15 facts about fleas
External parasites
Fleas are one of the most hated insects by pet owners. Once they find their way onto a dog or a cat, they are very hard to remove. Reproducing at a ve ...

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Adder
Adders stick out their tongue to orient themselves to their surroundings.
In doing so, they collect the scent around them and then transfer it to their mouth cavity to the so-called Jacobson’s organ, which analyzes olfactory signals.
Axolotl
In 1998, 6,000 individuals could be found per square kilometer of Lake Xochimilco.
In 2008 the number dropped to 100, and since 2013 no specimens have been found. Soon, axolotls may disappear from their natural environment entirely.
Insects
Insect sizes vary widely, ranging from less than 2 mm to more than half a meter.
The record holder, measuring 62.4 cm (24,5 in), is a representative of Spectra order. This specimen ...
Jellyfish
The smallest known jellyfish come from genera Eleutheria and Staurocladia.
They typically measure up to 0,5 millimeters in diameter.
Leeches
Thanks to these properties of the saliva, leeches, especially the medicinal leech (Hirudo medicinalis), are used in hirudotherapy.
It is a treatment method known to humanity since the beginning of civilization.
Blue tang
They live an average of 30 years in the wild.
Their average lifespan ranges from 8 to 20 years in captivity.
Siberian roe deer
Even though they are commonly mistaken for the European roe deer, they can be distinguished by their antlers.
The Siberian roe deer have larger, more branched antlers.
Turtles
Since 1500, 7 species and 3 subspecies of turtles have become extinct.
The last extinct species is Chelonoidis abingdonii, whose last representative died on June 24, 2012. ...
Hedgehogs
They can venture several kilometers while searching for food.
Red-necked wallaby
The life expectancy of a red-necked wallaby in the wild is between nine and 15 years.
Specimens living under human protection, i.e., zoos, usually live up to five years, but many cases are as long-lived as those in the wild.