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Any noise that a Strigidae owl would make, a Sentinel would make.

Hoots would be for long-distance calls, and would most frequently be used to announce oneself or send word over a distance (from Ranger to Ranger, for example). It's safe to describe the 'intent' of the hoot in an RP post, as was one with Lichen and Drywood in the 'Routine Check-up' RP.

Beak clacking is a sign of fear, distress, aggression, and general pissiness. A startled Sentinel might clack a couple of times, a Sentinel who is about to attack (or is acting like he/she is) would clack in conjunction with a poofed-up threat display, etc. The RP between Fletcher and the Brigadier when she was ready to go kill Tempest gives some good examples of Sentinel body language and sounds.

Chittering is a hatchling/fledgling noise, and is a sort of 'whiny' vocalization. Gimme food, gimme that, don't touch that stuff it's mine, etc. Like a kid going "EEeeeeeeeh" in a really annoying, nasal tone.

Peeping is a less whiny way of asking for food, and is one of the few noises that a hatchling would make. Fledglings would still make that noise as a sort of throwback to their youth, perhaps inadvertently when they are surprised or in an attempt to be particularly endearing to a parent/Minder.

Hissing is a strong aggression noise, as in cats. It could be used to warn of an attack, or as a bluff, or a startled Sentinel might hiss (and probably clack as well).

Young Sentinels tend to do more chittering and peeping, and less hissing/hooting/clacking. That's not to say that they wouldn't try to clack or hiss if they are being aggressive, but the noise produced wouldn't be terribly impressive at all (think of young Simba's roars). As Sentinels age they stop chittering and peeping, much as teens start to call their parents 'Mom and Dad' instead of 'Mommy and Daddy.'

Carrying something on their back would be subject to the same restrictions as in their talons, so far as weight is concerned. Same deal for overly bulky items. Since other critters (like mus, etc.) would tend to cling tight to the Sentinel's body they wouldn't be much of a bother. And most Sentinels wouldn't care about being 'ridden' any more than humans mind carrying a pet cat or having their rat/ferret climb on their shoulders.

There could be. Keep in mind that a 'plump' Sentinel would have trouble flying, however, so they'd best provide a service that is desired enough that they can have their necessities provided for them.

Favours. Sentinels use a barter system, but they can also barter for favours and future/ongoing services rendered. A Keeper could make an ongoing deal with a local Artisan, for example, to provide culls in return for getting their breeding stock marked with dye.

The 'wealth' of a Sentinel is, for the most part, bound up in either items or the individual. Favours that have been traded cannot be transferred to other family members, in most cases, so a Sentinel who trafficks in such things will not leave a fortune for his/her family. Heirlooms would be the most typical representation of Sentinel 'wealth', but since most individuals would be extremely reluctant to part with such items.. well. Peridot may have lots of extremely fancy jewels, but unless she's going to trade them for something she won't gain anything from them. A young Sentinel who came into an inheritance that he/she wasn't attached to might choose to barter it all away, but they wouldn't be very popular among other family members!

Inherited items will, in general, need to be discussed with staff before they can be approved.

A prime territory would certainly be an asset, and would make it easier for a Sentinel to become 'wealthy' - but a prime territory will also need to be defended. Prime territories are also something that should be discussed with the staff first, as we may eventually 'force' Sentinels to defend highly-desirable territories.

The Keepers would definitely be among those with the best idea of genetics, on a basic Mendelian level. Smart + smart = smart or smarter. Smart/small + dumb/big = average/average. That sort of basic understanding. They wouldn't be so advanced as to get the idea of a Punnett square, of course, but the concepts of line breeding and back-crossing would be something that Keepers would do. If you like how a particular mus looks/acts, breed it back to it's parents or other relatives! Makes sense, right?

Along those lines, they'd have noticed certain mutations and colour variations that crop up from time to time. Keepers, incidentally, would be among those who are most likely to be tolerant of genetic Aberrants (since they may have come across albinos in their lines) but they'd probably still cull those sorts of mishaps in most cases.

Thing is, the colour of a companion is probably one of the least important genetic traits it has - since most Sentinels who care about their companions will have them dyed to match. So a fancy merle mus may be something that your Keeper is interested in, but his charges would most likely be covered in dye once they leave his care. Something to keep in mind for his character - other Keepers would probably think it's a bit odd for him to care so much about something so frivolous rather than size/smarts/taste.

Either/or. If the parents plan to stay involved in the life of their adopted fluff then they'd usually keep the egg until it hatches and then name him/her before bringing the hatchling to the Minders. If they're just going to dump the egg and let it grow up as a member of the clan rather than a member of their family, then they wouldn't bother. It really depends on the specific circumstances!

Female Sentinels are fertile until they reach the age we would consider as 'elder'. Males remain fertile until they're too old and creaky to be able to get down to business. In general, most Sentinels will stop having eggs once their grandchildren are old enough to have eggs.

Yes and no. Just so long as both Sentinels are of a reproductively active age there wouldn't be any major head-turning. But if a really old Sentinel takes a really young Sentinel as his/her first mate then that would be considered a little odd. Taking someone younger as a mate after your first mate has passed on or left you isn't that odd, however. There'll still be some gossips and some whispering, but it wouldn't be horribly scandalous.

And, of course, nobody would ever dream of taking a fledgling as a mate. Even taking a too-recent graduate would be a bit odd - it's expected that they'll go through at least a season after graduating before they consider settling down and having eggs.

It'd be about the same for Sentinels as it is for us - you can generally tell by voice, but there are some manly gals and some girly guys.

Given that, in general, the human concept of an afterlife (and more specifically, heaven and hell) is rooted in a religious system that operates as a set of societal morals, it's rather unlikely that the Sentinels would have a similar construct. Their religion is simple, and it has nothing to do with their laws (unlike most human religions). They believe in Noctus, and the extent of their afterlife beliefs is that after they die they 'return to Noctus' - most Sentinels tend to be too practical to dwell on what exactly that means.