If we as a society care about endangered species, there should be an option to make or improve habitat for such species to offset development.
Making or improving habitats for endangered species most effectively involves: leaving them the hell alone.
Getting a construction company to commit to curating (or financing) the habitat for endangered species is a specious political solution that favours continuing with unsustainable construction over essential habitats. I bet there is not a single case where this has been long-term effective.
In California at least, there is a prohibition on picking carcass of birds and animals even if it’s on your own property. They have to be surrendered to sanitation Dept if in an urban area or fish and game outside city limits.
This is mostly to discourage trade in animals and birds captured for medicinal purposes or for selling to taxidermists looking for specimens. Even roadkill is prohibited.
In birding for instance, there's often an unwritten rule of obscuring locations of rare species when it's reasonable to think additional traffic would threaten the bird.