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Re: dromaeosaurid intelligence
I´ve to apologize to some mistakes I´ve made and Adam Britton corrected
very precisely. Indeed the crocs have social behaviors, now being much
deeply studied than before, and just a few of them keep the agressive
position at others.
Then Adam reinfoced what I was trying to say: that the crocodilians,
even if they're that primitive, have very advanced behaviors, including the
social ones. So, if you transfer these notes to a dinosaur, such
Dromaeosaurids, they might have been very smart and probably capable of
doing things we cannot even imagine nowadays. But, it's only a theory.
Another real fact is the density of neurons per inch. If the Droameosaurids
had a big density of neurons per inch, they could have been much more
smarter than if they've had small density.
If we take the predator/prey point of view, as the predators evolved
more complex hunting tactics, so do their preys, developing more complex
deffensive tactics. Then, the nature keeps its balance.
Apologies and greetings,
( firstname.lastname@example.org )
"Dinosaurs are the most interesting and amazing mystery of nature!"
----- Original Message -----
From: "Adam Britton" <email@example.com>
To: "Dinosaur Mailing List" <firstname.lastname@example.org>
Sent: Wednesday, May 23, 2001 10:54 AM
Subject: Re: dromaeosaurid intelligence
> ----- Original Message -----
> From: "Marcel Bertolucci" <email@example.com>
> > To the brain mass to body mass ratio matter, the question is: how
> > far does it goes?
> There has to be a lot more to it than just this. Take _Craseonycteris
> thonglongyai_, the bumblebee bat. Once a candidate for smallest mammal on
> Earth, adults weigh around 2 to 3 grams. I have no idea what percentage of
> body weight the brain takes up, but even if we say brain weight is 1% of
> body weight, we have 0.02 grams of neural tissue that is capable of highly
> advanced echolocation (sound production, hearing and interpretation),
> behaviour (bats are highly social animals), significant spatial memory and
> orientation ability, complex flight AND the various behaviours associated
> with controlling a relatively complex body. Pretty neat stuff for such a
> physically tiny creature, regardless of its brain to body weight ratio.
> > This is
> > strange to crocs, because they normally are territorialists and
> > with each other, mostly in feeding matters. This tolerance behavior
> > explained by the survival instinct, but not for crocs. Other question is
> > that the male crocs accept female crocs in their territory in the mating
> > season, but not other male crocs, as it happens in this case. Could it
> > the 'smart' sense of crocs working for their benefit?
> Actually, the majority of crocodiles are highly gregarious and social, and
> only a few species are considered territorial (eg. saltwater crocodiles)
> solitary (eg. dwarf caimans) - and then only as mature adults. Social
> behaviour is vastly underestimated in crocodilians, and definitely never
> your information on crocodilian social behaviour from the Discovery
> A large array of different behaviours have been recorded in crocodilians,
> including their ability to produce a remarkable array of complex (ie.
> combined) signals using visual, auditory, chemical and tactile cues.
> Crocodilians also have a well-developed ability to learn associatively,
> to recognise any combination of signals (visual, auditory, chemical,
> tactile) linked to events in both space and time. For example, Nile crocs
> will move to particular locations at particular times of year to take
> advantage of events (eg. migrations), and they hunt cooperatively. Pack
> hunting behaviour has been reported in Cuban crocodiles, and all species
> show complex parental care and short-term pair bonding in some. In
> captivity, crocodilians can be trained to respond to specific signals (ie.
> names) and commands. They learn such commands very quickly, sometimes
> only 1 to 2 reinforcement attempts through habituation, operant or
> conditioning. Most zoological exhibits are now considering training their
> crocodilians for management purposes (eg. moving into a holding area when
> bell sounds), and most people who work with crocs recognise their ability
> take advantage of routine opportunities. This is from an animal whose
> weighs 0.005% of its body weight, although in hatchlings it starts out
> relatively much larger (0.9% body weight).
> I can't find it right now, but there was some work being conducted in
> on American alligators which showed they had a proportionally higher
> density in the cerebral cortex of their brains compared with certain other
> vertebrates (quoted, but I can't remember so I won't make a guess),
> tentatively suggested by the neurobiologist as a possible explanation for
> their apparently high degree of complex behaviour relative to their brain
> size. If I can relocate the notes I'll elaborate further.
> Adam Britton