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This is not a direct answer to your question, but I want to point out that your basic premise is partially incorrect. Other felines also form social groups. For instance, male cheetahs form coalitions (also see Cheetah outreach at http://www.cheetah.co.za/c_info.html), often for life, which generally makes them more successful in defending territories. ...


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First, i would look at statistics: just because (hypothesis) you visit 1000 watering holes /marshes a year and they have frogs in them it doesn't mean that its a common occurrence; Second, i think froglings (yeah, i know :D ) hatch whenever there is rain, grow, mate and deposit new eggs that survive droughts. Now, these can be relocated by earth movements ...


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I don't imagine a frog is going to go hopping over a hill to get to a marsh on the other side, is it? Why not? In wet weather, the conditions would be just fine for an enterprising amphibian to go exploring, perhaps driven by predators or lack of available resources, not to mention Ro Siv's comment about wind-borne dispersal of animals. Birds of prey ...


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I don't think your core question can be answered exactly, namely "...the theoretical maximum population to which the Tiger species could be restored", since there are too many variables to consider. However, the comment from @Remi.b is apt, in the sense that it shows that population growth rate per se (or reproductive rate) should not be the limiting factor. ...


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Both. Many primates bite their nails. Some do not. It's not species specific. Chimpanzees, for example, usually bite their nails; some prefer to leave them alone. They do grow continuously, and nails not kept trimmed probably break off (looking at the thickness of those nails, I get the impression that this might be rather painful if they break too short.) ...


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Why some human beings bite their nails? Because, they are primates - it is inherited way to treat our nails, called onychophagia. While normal in some primates (and this is the way they treat their nails), it is considered abnormal in human.


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Male grasshoppers often mate several times with multiple female, and some females will mate again after, and perhaps even before they lay their eggs. So no, they are not monogamous. Rufous grasshoppers for example have a very special mating cycle, the male will attract other females, possibly more than one with "pursuit sounds". After copulation, he keeps ...


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Short answer: many species can drop a regrown tail again and again again, however a few can only drop it once, while some lizards cannot drop their tails at all. It all depends on the species. Background information: According to this site the tail will only be able to be shed above the site it originally broke off. Although according to UCSB there are a ...


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The overall shape appears to match that of a flatworm or planarian, but those don't have eyestalks. Also, in the images you posted, none of the worms appear to have the characteristic eyespots of a flatworm, although they DO look planarian-like in some photos: If they didn't look so thin, I'd say they were common garden slugs. We get them all the time ...


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I am not too sure but this seems like Polycelis sierrensis. Though it is apparent that the worm in your pictures is a tricladid planarian, I was not too sure about the species and the geographical distribution. However, from the Smithsonian list of freshwater planarians in North America, I deduced that this should be Polycelis sierrensis which is found in ...


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Their capacity to elongate / contract and their two head lobes make me think they are Planarians. The two points on their heads must be their eyes: https://en.wikipedia.org/wiki/Simple_eye_in_invertebrates#Ocelli_or_eye_spots


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Short answer Echolocating bats have relatively large sensory epithelia in their inner ear, that may correlate with their high upper frequency limit of up to 200 kHz. The basilar membrane is thinner and stiffer, possibly allowing it to decode higher frequencies. Background In terms of the place theory of hearing, the cochlea acts as a frequency transformer, ...



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