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Science girl

21 May, 4 tweets, 2 min read

The Golden Tortoise Beetle (Aspidimorpha sanctaecrucis) gets to stroll around looking beautiful in the rainy seasons of south east Asia but in its larval stage things were less glamorous... but extremely interesting read on .. 1/

Credit: IG sony_Thokchom

2/ In its larval stage their defence mechanism is a faecal shield or faecal parasol, which it uses as a weapon if threatened.

3/
Source of video in tweet 1 sony_Thokchom
Source of video in tweet 2 cutt.ly/3b4Shno

Even more bizarre if there is multiple larvae they form a pyramid with shields facing outwards and of mum is still around she places herself on top Like this cutt.ly/ab4Sk4R

4/ Just to clarify the beetle in tweet 2 is Charidotella sexpunctata, not Aspidimorpha sanctaecrucis both tortoise beetles and both make the fecal shield to ward off threats such as parasitic wasps cutt.ly/DzS3auS
cutt.ly/Vb4Gp6K

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Science girl

@gunsnrosesgirl3

30 Mar

Reindeer Cyclones are a real thing... a swirling mass of threatened reindeer stampeding in a circle making it impossible to target an individual.. here the fawns are in the middle

This herd is on Russia’s Kola Peninsula, in the Arctic Circle

The video was originally posted on the Facebook page of the Museum of Anthropology and Ethnography Peter the Great, aka Kunstkámera, located in Saint Petersburg, Russia.

The video is worth watching to the end also here’s some reading cutt.ly/px5zQYq

Read 4 tweets

Science girl

@gunsnrosesgirl3

15 Sep 20

Does every fig contain a wasp?

Figs are are inverted flowers. There are males and females.

A female wasp (carrying pollen) enters a fig through an opening so tight she loses her wings and her antennae. If it’s a male fig, it is perfectly formed to lays her eggs inside. 1/

2/
The fig acts as a womb and a nursery to the offspring.

Once hatched the males who lack wings impregnate the females and dig tunnels through which the females escape.

Here you can see females climbing out. These will go on to repeat the cycle, taking pollen with them...

In this relationship there is also betrayal. Fig wasps are the fig tree’s closest allies yet in its reach to further its own reproductive aims, it deceives the wasp to climb also into female flowers, in which they can’t reproduce and it becomes their tomb. How does it do this? 3/

Read 5 tweets

Science girl

@gunsnrosesgirl3

22 Jun 20

This floating boat is a type of mirage called a Fata Morgana and it is formed when rays of light are bent when they pass through air layers of different temperatures in a steep thermal inversion with an atmospheric duct which acts as a refracting lens. 1/

Normally warmer air is close to a surface, but a thermal inversion is the is where warmer air exists in a well-defined layer above a layer of significantly cooler air. The air here is cooled by the water.
A Fata Morgana requires an atmospheric duct. 2/

If the thermal inversion is strong , the curvature of the light rays within the inversion layer is stronger than the curvature of the Earth “super-refracting” so traps them. This is the duct. It will propagate the rays along the surface of the earth rather than dissapating them

Read 5 tweets

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