Crescent-shaped barchan dunes are common on both Earth (left image) and Mars (right image). They form in areas where the wind comes predominantly from one direction. As the wind blows, it deposits sand on the gently sloping windward face of the dune. The leeward face of the dune is steeper; its shape is set by the sand’s angle of repose—essentially the steepest angle the sand can maintain without an avalanche. Barchan dunes are very mobile, moving between one and a hundred meters per year. They have also been seen moving through one another or moving along in formation. (Image credits: Google Earth, NASA/JPL/University of Arizona)

➜ Hi Gerardo. Thanks for the reblog. I feel honoured! You are collecting some really “biutifulpics" over there! :) Keep it up!  —- saltations replied to your photo post: ”nice shot, so delicate!” ➜ Thank you! Kneeled & crouched vs. camera shake. Haha! Stop! f/3.2 & 1/800th at a focal length of 200mm should match anyway! :D  —- der-gorgonaut replied to your photo post: ”Tolles Bild” ➜ Guten Abend Georg. Schönen Dank! Auch ich kann das Kompliment - bezogen auf viele Deiner Fotos - nur zurückgeben!   —- And finally a friendly ‘hello’ to all the (new) followers, likers & rebloggers. Thanks a million! Best wishes, Jörg

Windblown snow bears a certain resemblance to desert sands or a Martian landscape. Many of the same aeolian processes—like erosion, transport, and deposition—take place in each. The animation above shows an example of suspension, where fine snowflakes are lifted and carried along near the ground. Larger snowflakes may bounce or skip along the surface in a process called saltation. For more, check out some of the crazy things snow does or learn about how dunes form. (Image credit: Redemption Designs, source video)


Sediment transport via fluid motion is a major factor in engineering, geology, and ecology. This video shows two common forms of sediment transport: particle suspension and saltation. Suspension, in which the fluid carries small solid particles, is visible high in the blue water layer. Saltation occurs closer to the surface when loose particles are picked up by the flow before being redeposited downstream. Watch some of the individual particles near the surface to see the process. Kuchta has several more demo videos of flow in this desktop flume, sold by Little River Research & Design. (Video credit: M. Kuchta; submitted by gravelbar)

Explosive Breeding Aggregations and Parachuting in Agalychnis saltator

Agalychnis saltator (Hylidae) isa relatively small red-eyed frog, with adult males ranging from 34 to 54 mm and the larger females ranging from 57 to 66 mm.

This red-eyed leaf frog occurs in the humid lowlands of Nicaragua, Honduras, and Costa Rica.

Agalychnis saltator gathers in spectacular breeding aggregations on lianas above temporary swamps. Both males and females descend to breeding aggregations by parachuting and return rapidly to the canopy by hand-over-hand locomotion up lianas. 

References: [1] - [2] - [3]

Photo credit: ©Brian Kubicki

Locality: Costa Rica

let’s imagine that together
we are one untranslatable word.
our meanings cudgelled to something
that breathes only at the boundaries of accidents.
an orphaned nuance. semaphored, then gagged.  

let’s try to make this confusion beautiful
the best way we can - let’s sky over what is
fustian, garbled, like our bodies were shapeless
hyperboles. maybe make syntax out of silhouettes.

consider  cafune, & best explain it as the way
night licks the last embers of wind from a wolf’s fur.
or how that an egret saltates against
the silvered foil of an idle stream.

maybe i  fernweh, that debt of distance always
cursing me out to ransom. that cartography
i covet but can’t contain. your body growing
into an echo -  memory turning into mourning.

dear circus lion, i’d rather watch & winnow
a bonfire of ticket-stubs than to think of
all the nights you stagger rehearsing your dance
through those bronzed wreaths of tameless flames.
i’d rather the jaws of serengeti, the empire of a maneater
not this declawed animal cowering in the incongruence of shame.

let’s imagine that we can stitch up a scarecrow
from all the wool we pulled over each other’s eyes
& refuse the liquorice-winged omens their nesting
feast. let’s allow me a moment to watch desire fled
like a colt cutting through a tremble in the barley.

let us forget that the day you told me about your dream,
you had a spot picked, a bridge, a precise height
from where to dive & i didn’t think about my father
- same age as you when he hushed his own heartbeat
- his body bloated to a blue lily; thick with strangled
nightmares; floating against a seasurf of spanish red.  

consider  ya’aburnee :
the final plea
that you will bury me.

Scherezade Siobhan

cafune (Brazilian Portugese) - running your fingers through your lover’s hair
fernweh (German) - wanderlust for a place you have never been
ya’aburnee (Arabic) -  a declaration of one’s hope that they’ll die before another person because of how difficult it would be to live without them.