Offers have message section:::

When you are leaving an offer on someone's trade, I'm thinking it would be great to have a text box to write in, because you can't 'trade lions not weaned from their moms yet', you can't 'offer studs'. not to mention with how many items you can put in/on an offer, the 'text box' would make it easier to leave notes to the one who will be looking at your offer.

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Display pictures for cubs in trades/offers:

Maybe there is a button you can get to 'see' the cub'. Sometimes I make mistake of buying cubs, who appear when i search for gorilla fodder, and thinking they're 'right' i buy to realize its wrong...with that being said, why are these guys appearing when you aren't even looking for it?
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"Specific trades":

Lost count how many times, seeking gorilla fodder i get results for adolescents, or cubs with wrong color but right marking and such. There should be a button for where you click that shows 'exactly' what you are looking for, so as an example...you need 'blue eyes, jet base cub', you don't get cubs with blue eyes, but no jet base'...etc.
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"Reserve"

Kind of like bookmarking, but you can 'reserve a spot' in trades, of course the owner of the trade can remove your reservation if they wish. But sometimes i seen people cancel trades because 'not enough people seem to 'look' at it'. Maybe they were busy and didn't have time to offer anything yet,or maybe they're on a device that is inconvenient for them, or perhaps the cubs they wish to offer aren't ready yet?

You can click 'reserve' on someone's trade, obviously you don't get an actual 'spot' but the owner will look and go 'oh, someone is interested...maybe I won't cancel my trade yet and wait a little bit and see if they may return with a trade".

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