6 votes
Accepted

What terrestrial trait makes cetaceans so successful in an aquatic lifestyle?

Thermoregulation and echolocation both depend on evolutions that occurred on land and seem to be less accessible to fish than to the ancestors of mammals. The heat capacity of water is much greater ...
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  • 3,260
3 votes
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Are there any natural forms of aquatic vegetation which do not stand up in water?

Yes there are many aquatic plant species which do not stand up in water. You need to look at the lifeform of the plants, such as introduced by Raunkiaer ( https://en.wikipedia.org/wiki/Raunki%C3%...
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  • 358
2 votes

Land Shrimp Sighting (Western Europe): What is it?

The size (~2 inches), broad "quadrate" head, and long posterior abdomen leads me to believe this is a relative large larva of a Predaceous Diving Beetle (family Dytiscidae). The larvae are ...
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2 votes

What terrestrial trait makes cetaceans so successful in an aquatic lifestyle?

Advantages of air breathing over gills? Keeping in mind water-breathing animals could still evolve lungs. Not being vulnerable to parasites and diseases of the gills, which are obliged to have blood ...
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1 vote
Accepted

Fresh Water Fish Identification

Could well be the Rosy Barb, which is a common beginner fish (I believe, not being an owner of a tank at all). They have a distinctive reddish colouration which is brightest when in the mating season, ...
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  • 7,808

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