Updated October 14, 2026
If the Finalise Release Group button is greyed out in Planet Zoo 2, check the group's requirements before assuming something is broken. A group can be created successfully but remain pending until you assign the right animals and satisfy the conditions displayed in the group editor.
The requirements depend on the species and the selected group type. For example, a Mountain Hare Mixed Group has specific requirements for its male and female members, fertility, and genetic diversity. Other groups can have different compositions, so copying another species' setup may not work.
This guide explains how to check the requirements, add eligible animals from Trade Centre storage, and troubleshoot a group that still will not finalise.
Quick Answer
If the Finalise Release Group button is greyed out:
- Open Animal Trading & Storage and select Release Groups.
- Open the pending group and inspect its displayed requirements.
- Select Edit Group Members and assign eligible animals from Trade Centre storage.
- Check the required number of males and females, along with any fertility or genetic-diversity thresholds.
- Return to the group overview and check whether every requirement has been met.
If the button remains disabled, look for an unmet requirement rather than repeatedly clicking it. The game displays a message explaining that all requirements must be satisfied before a pending group can be finalised.
📋 Table of Contents
- Quick Answer
- 1. Check the Release Group Requirements
- 2. Assign Animals to the Pending Group
- 3. Check Fertility and Genetic Diversity
- 4. Make Sure the Animals Are in Trade Centre Storage
- 5. Choose the Correct Group Type and Reserve
- 6. What If the Group Still Won't Finalise?
- Frequently Asked Questions
- Final Tip
1. Check the Release Group Requirements
The first step is to inspect the group you created. Different species and group types can require different numbers and combinations of animals, so there is no single membership rule that works for every Release Group.
Open Animal Trading & Storage, select Release Groups, and choose the pending group. Review the member count and any requirements displayed on the screen.
For example, a Red Deer Mixed Group can require two males and two females. A different group type for the same species may use a different composition.
Pay attention to the numbers shown beside the group members. A group displaying 0/4 has not yet filled its four required member slots. If the male and female counts are also zero, you still need to assign the animals before the group can be finalised.
What to check first:
- Is the correct species selected?
- Does the chosen group type match the animals you intend to use?
- Are all required member slots filled?
- Does the group meet its displayed sex-ratio requirements?
- Are any additional conditions still unmet?
Do not assume the group is ready simply because it appears in the Release Groups list. A pending group is not the same as a completed group.
2. Assign Animals to the Pending Group
Creating a Release Group does not automatically fill it with animals. You must assign suitable members to the group.
To do that:
- Open the pending Release Group.
- Select Edit Group Members.
- Review the available animals in Trade Centre storage.
- Select suitable animals for the empty member slots.
- Check the updated group requirements before leaving the editor.
If the group requires four animals but only two suitable animals are assigned, the missing members can prevent finalisation. The same applies if the group requires a particular male-to-female ratio and the selected animals do not satisfy it.
Why does Edit Group Members show no animals?
If the selection list displays None, check whether suitable animals are actually available in Trade Centre storage. An empty list does not mean the game has automatically filled the group or waived its requirements.
If you have animals elsewhere in your zoo, check their current location and use the available animal-management options to move eligible animals into storage where appropriate. Then reopen the group editor and check the available selection again.
Remember that an animal being present in your zoo does not automatically mean it has been assigned to the pending group.
3. Check Fertility and Genetic Diversity
Some Release Groups have additional requirements beyond the number and sex of their members. Fertility and genetic diversity are two conditions to check when they appear in the group editor.
A Mountain Hare Mixed Group provides a useful example. Its displayed requirements include:
- Male members: 2
- Female members: 2
- Minimum fertility: 15%
- Minimum genetic diversity: 20%
These thresholds apply to the demonstrated Mountain Hare Mixed Group. Do not assume that every species or group type uses the same numbers.
If the group has the correct number of animals but still cannot be finalised, inspect these additional values. A group can have all its member slots filled while remaining ineligible because one of its other requirements has not been met.
What if the fertility or genetic-diversity value is zero?
First, check whether the group has any members assigned. An empty group can show zero values because no animals have been added.
Next, inspect the individual animals and the group's displayed requirements. If the relevant value remains below the required threshold after assigning animals, you may need to select different eligible members.
Do not keep adding animals at random. Use the displayed requirements to identify which condition is preventing completion.
4. Make Sure the Animals Are in Trade Centre Storage
The Release Group member editor uses available animals in Trade Centre storage. If you cannot find an animal you want to assign, check where it is currently located.
For example, an animal in a habitat can be moved to Trade Centre storage using the available animal-management action. Once it appears in storage, return to the Release Group editor and check whether it can be selected.
Follow this checklist if the animal list appears empty or incomplete:
- Open the animal-management or storage screen.
- Check whether the intended animals are in Trade Centre storage.
- Verify that you are looking at the appropriate animal category and species.
- Check any active filters that might hide available animals.
- Reopen Edit Group Members and inspect the list again.
If the animals still do not appear, do not assume that they automatically qualify for the group. Confirm their eligibility and whether the group type accepts the animals you want to use.
5. Choose the Correct Group Type and Reserve
The group type affects the animals you need to assign. When creating a Release Group, inspect the available options rather than selecting the first one by default.
Depending on the species, options may include mixed groups, family-based groups, or a solitary-male group. The available choices and their requirements vary.
The creation screen also provides filters that can help you narrow down suitable choices, including options related to species roles, biomes, ecosystems, and valid Wildlife Reserves.
These filters are useful when you are planning a release, but they do not replace the requirements shown for the specific group. Check both the group composition and the intended reserve before committing to the release.
Check the destination ecosystem, too
A valid Release Group and a suitable Wildlife Reserve ecosystem are separate considerations. Completing the group requirements does not automatically establish that every ecosystem is ready for the species.
If your group is ready but you are having trouble preparing its destination, see our related guide: Planet Zoo 2: How to Fix an Ecosystem That Isn't Established.
That guide explains how to diagnose unmet ecosystem requirements, including missing terrain or nature features, before expecting an ecosystem to become established.
6. What If the Group Still Won't Finalise?
If the Finalise Release Group button remains greyed out, go through the following checks in order.
1. Recheck every requirement.
Return to the group overview and look for any missing members, incorrect sex ratios, or unmet fertility and genetic-diversity conditions.
2. Reopen the member editor.
Confirm that the intended animals are actually assigned to the group. Animals visible elsewhere in your zoo are not necessarily members of the pending group.
3. Verify the group type.
If the required composition does not match the animals you have available, check whether another group type is offered for that species.
4. Check animal storage and filters.
If animals are missing from the selection list, confirm their location and review any active filters before trying again.
5. Read the button's tooltip.
When the Finalise Release Group button is disabled, hover over it to see the explanation. The message may identify the remaining requirement that needs attention.
In the usual requirements-blocked case, the game explains that a pending Release Group must have all its requirements met before it can be finalised. This is a reason to inspect the group, not evidence by itself of a bug.
What if you can click Finalise but the group never forms?
That is a different problem from a greyed-out button. If you meet the displayed requirements, select Finalise Release Group, accept the confirmation, and the group still does not form, the normal checklist may not resolve it.
Check whether the animals remain in storage or whether the group still appears pending. If the problem persists, try reopening the relevant menus or restarting the game, then check again before attempting another finalisation. Avoid repeatedly confirming an action without checking the group's state.
If the group still fails to form despite apparently satisfied requirements, treat it as a possible game or storage issue rather than assuming that every group has another hidden requirement. A report of a similar problem is not enough to establish a universal cause or a guaranteed fix.
Frequently Asked Questions
Why is Finalise Release Group greyed out in Planet Zoo 2?
The first thing to check is whether every requirement for the pending group has been met. Open the group and inspect its member count, required animal composition, and any additional thresholds shown in the editor.
Does every Release Group need two males and two females?
No. Requirements depend on the species and group type. A Mountain Hare Mixed Group or a Red Deer Mixed Group can have different requirements from other groups, so follow the values displayed for your selected group.
Why does Edit Group Members show no animals?
There may be no suitable animals in Trade Centre storage, or the available list may be affected by the current selection or filters. Check storage and eligibility, then reopen the member editor.
Why is my group still pending when all four animal slots are filled?
Filling every slot does not necessarily satisfy every requirement. Check whether the group has a minimum fertility or genetic-diversity threshold, or another condition displayed in its overview.
Is a greyed-out Finalise button a bug?
Not necessarily. If the game says that the pending group must meet all its requirements, start by addressing those requirements. A failure that occurs after you can confirm finalisation is a separate issue and may need further troubleshooting.
Can I use any animal from my zoo?
Do not assume so. You need animals that are available to assign and suitable for the selected group. Check their availability, the group type, and the requirements displayed in the editor.
Final Tip
When a Release Group will not finalise, check the requirements before troubleshooting the game itself. Confirm that the correct animals are assigned, satisfy the displayed composition and eligibility conditions, and make sure the group has no remaining unmet thresholds. This is the quickest way to distinguish an incomplete group from a problem that occurs after finalisation.
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