Saturday, 25 May 2019
Some of these sounds - such as a cat's purr - are found only in a single group of related animals. (Not all wild cat species purr, of course, but many do). Others are, at least in general terms, produced by a range of different species, often in quite similar circumstances. One of these is the 'scream', an unusually loud call that is typically high-pitched. Screams also commonly include rapid, chaotic, changes in frequency and amplitude that we humans interpret as a harsh, inherently unpleasant, sound - and there's likely good reason for that.
Sunday, 19 May 2019
Scientifically, voles have also been mixed in with the mice at different times. While they have recognised as a distinct group with their own scientific name since 1821, for much of the 20th century they were considered a subgroup within the wider mouse family. That's really only changed in the last 20 years or so, as genetic and biochemical evidence has shown that the two groups, while related, have distinct evolutionary histories.
Sunday, 12 May 2019
|Spot the real lion|
It's not really any different with prehistoric mammals, with mammoths, mastodons, and sabretooth cats being the ones that most people would instantly recognise and be familiar with. Even dire wolves, which weren't really all that big, are surely better known than, say, extinct foxes or weasels of the same age. Which brings up a second point: even if an animal isn't as large as an elephant or Diplodocus, being unusually large for a carnivore will still help its public profile enormously.
Sunday, 5 May 2019
One approach is to maximise the chances of each of your offspring surviving. This is called the K-selection strategy, and results in the population being as close to the maximum capacity of the local habitat as possible. (The 'K' stands for 'capacity'... in German). Such animals don't need to reproduce very often, or produce very many offspring when they do, but they have to invest a lot of resources in their survival. They tend to be relatively large animals, with few predators... elephants, primates, and whales are all good examples among mammals. Humans are a particularly extreme example, given how long it takes us to raise our children, and, as with other strong K-selectors, twins are rare in our species.