Hi, I'm Andrew and I’m just a simple 19 year old guy and zoology student that posts random factoids about obscure animals and general animal science/zoology/biology stuff so if you like animals this is the place for you, if you only like cute animals this is not the place for you… Also I can ID any animals you might need identified (just submit them to me).

Disclamer: none of the pictures are mine unless stated

Family Polioptilidae: A family of passerine birds commonly known as "Gnatcatchers". All gnatcatchers are native to the New World, being found in both North and South America. Gnatcatchers are close relatives of the wrens and some species are known as "Gnatwrens".

Image: Erikwlyon

 

How do certain invertebrates know if they are rightside up?

the science of statocysts 

certain types of invertebrates like bivalves,echinoderms and cnidarians lack sensory receptors, buy yet they know if they are upside down or not and can right themselves up if knocked over. This is due to a special balance sensory receptor called a statocyst, a statocyst can be easily described as a marble inside a basketball, as the statocyst consists of a sac-like structure with a small ball-like mass inside of it called a statolith. The walls of this fluid filled sac are lined with small setae (hairlike structures). Which when the animal moves or is overturned the statolith inside the sac will respond to gravity and fall into the hairs which in turn will activate neurons that tell the animal what orientation it is in so it can adjust accordingly.

Further reading

Image sources: 1,2

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