Silversides

Silversides swirl through mangroves like a river in the sea. They are carnivorous fish with silvery band along each side of their bodies. The dense forest of roots offers welcome shelter for the finger-size fish, which form large schools to try to confuse predators. Mangroves enhance reefs by providing a nursery area for vulnerable creatures and by trapping sediment that can smother coral. They also store carbon that might otherwise contribute to global warming. 

(Adapted from Encarta encyclopedia and National Geographic magazine)

Viruses on other life-bearing planets

It has been proposed that viruses are likely to be encountered on other life-bearing planets. Efforts to discover current or past life on Mars is an active area of research. On 24 January 2014, NASA reported that current studies on the planet Mars by the Curiosity and Opportunity rovers will now be searching for evidence of ancient life, including a biosphere based on autotrophic, chemotrophic and/or chemolithoautotrophic microorganisms, as well as ancient water, including fluvio-lacustrine environments (plains related to ancient rivers or lakes) that may have been habitable. The search for evidence of habitability, taphonomy (related to fossils), and organic carbon on the planet Mars is now a primary NASA objective. 

(Wikipedia encyclopedia)

Diversity in nature

Consider the world of created beings, how varied and diverse they are in species, yet with one sole origin. All the differences that appear are those of outward form and colour. This diversity of type is apparent throughout the whole of nature.

Behold a beautiful garden full of flowers, shrubs, and trees. Each flower has a different charm, a peculiar beauty, its own delicious perfume and beautiful colour. The trees too, how varied are they in size, in growth, in foliage -- and what different fruits they bear! Yet all these flowers, shrubs and trees spring from the self-same earth, the same sun shines upon them and the same clouds give them rain.

So it is with humanity. It is made up of many races, and its peoples are of different colour, white, black, yellow, brown and red -- but they all come from the same God, and all are servants to Him. 

- ‘Abdu’l-Baha  (From a talk on October 28^th, 1911, Paris, France)

Octopus releasing protective ink

This algae octopus, Abdopus aculeatus, has just inked. Octopuses release ink when they feel threatened; the ink swirls into a dark cloud that distracts predators. The adaptation is ancient: Ink sacs are present in fossils of octopus ancestors that are more than 300 million years old. 
(National Geographic magazine)

Arizona, USA: Lightning & rainbow

In the Sonoran Desert near Red Rock, Arizona, a fast-moving electrical storm and a rainbow share the sky in this composite image. Several ranges in this part of Arizona, USA—including the nearby Tortolita Mountains—help spawn thunder and lightning. 
(National Geographic magazine)