Although I'm new here, I've decided to start a new topic of discussion after much appreciated encouragement from you guys (Dawn, Nathe, Mikka & Romeo etc)

After reading through most of the expedition reports on AYR, I noticed some startling differences in the behaviour exhibited by Yowies & Bigfoot.
Most of the Bigfoot reports I've read so far involved rather 'fleeting' glimpses of the creatures. By most accounts, the Bigfoot/Sasquatch of the North American continent seems a rather shy, elusive & retiring creature. The 'close encounters' usually range from vocalisations (sans sightings), sightings (sans vocalisation), sightings + vocalisations (rare), responsive tree-thumping (sans sightings+vocalisation), responsive tree-thumping+vocalisation (sans sightings) and very rarely - rock throwing (sans sightings). I've discounted the odd reports which allege Bigfoot 'abductions' of humans, or 'continuous interaction' with human neighbours as unreliable, because they are more often than not, related by colourful characters who are not too credible by ANY standards.
By contrast, the Australian Yowie encounter reports often read like action-packed thriller/stalker novels

What do you guys think are the contributary factors to this curious contrast in Yowie/Bigfoot behaviours? I've made a list of 'possibilities' below. Would welcome your observations & opinions on this issue.
a) The 2 species have inherently (biologically) different behavioural profiles/traits as individuals.
b) The 2 species have inherently (biologically) different cultural dynamics as community groups.
c) The 2 species live in extremely different environments, which contribute to the evolution of extremely contrasting survival behaviours. (ie: Bigfoot - vast expanse of mountainous, temperate woodlands provide opportunities for non-confrontational, solitary/single-family-unit survival. Yowie - harsh weather/geographical extremities with varying environs mountainous woodland, thick bush/scrubland - conducive for ambush hunting, family/tribal units preferred for effective survival.
d) Bigfoot (pl) are more inclined to retire to the remotest parts of the wilderness which are not easily accessible by the general public, thereby lessening the Bigfoot-human encounters and avoiding the necessity to be territorially agressive. While Yowies are more inclined to be opportunistic survivalists (harsher environs, scarcer resources) and shadow human habitation for 'easier meat', so they have established agressive territorial behaviours due to generations of human encroachment into even the remotest parts of the Australian continent (1st by the Aborigines, then by the pioneers/ranchers/miners).
e) The Yowie researchers are somehow (dare I say it?) better skilled at tracking, hunting and luring the creatures and are therefore more adept at producing 'too-close-for-comfort' encounters with the Yowies than the Bigfoot researchers could with the Bigfoot (pl). -

Well these are just a few thoughts that I've been juggling around in my noggin for the past week. Would you guys like to discuss this? Please feel free to respond.
Don't know why, but I kinda get the feeling that if we could 'figure' out the 'why's behind these behavioural traits, then perhaps we could devise even better strategies to get even closer encounters or outsmart them enough to get some credible footage or other tangible evidence.