All of the above
Enhancement of Survival Permit
Incidental Take Permit
Safe Harbor Memorandum of Agreement (SHMOA)
Biological Evaluation (BE)
Biological Assessment (BA)
Memorandum of Agreement for Authorized Incidental Take (a "Take MOA")
Habitat Conservation Plan
National Association of Home Builders v. Babbitt
Kleppe v. Sierra Club
Gifford Pinchot Task Force v. United States Fish and Wildlife Service
TVA v Hill
The Code of Federal Regulations (CFR)
Section 7 of the Endangered Species Act
The "Consultation Handbook" of 1998
Where effects will be insignificant, discountable, or beneficial
Where the agency has no discresion in taking action
When the only agency action is granting or denying a permit for an otherwise private action
A BA is defined under ESA. A BE is a generic term not mentioned in either the Act or the CFRs.
A BA is for formal consultations only. A BE is for informal consultation.
A BA is prepared only for federal actions that require an EIS. BEs are for all other types of actions.
A BA is for federal actions. A BE is for non-federal actions.
Here's an interesting quiz for you.