In other words, if for example an oasis has:

10 rats

7 spiders

5 wolves

5 bears

6 crocodiles

4 elephants

You would need 24 cages to take all 4 elephants, 34 to get all the crocs. The oasis would still have 4 rats and 1 spider.

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Actually, it would only take 32 cages to get all the crocs.

There are only 5 wolves and bears in your example.

4 (passes) * 6 (animal types) = 24 and leaves:

6 rats, 3 spiders, 1 wolf, 1 bear, 2 crocs

The next pass (*from left to right*) collects 5 animals (29 total cages) and leaves:

5 rats, 2 spiders, 1 croc

The next pass collects 3 animals including the last croc to give a tally of 32.

At that point you have 4 rats and a spider left -- and you'd be much better off using any remaining cages in your inventory on a different oasis at this point.

But it would take 2 more cages to get the last spider, then 3 more to get the remaining rats -- but those are all but worthless.

FYI, the defense values of nature animals:

[TABLE='width: 400, align: left']

[tr]

[TD='align: center']**Animal**[/TD]

[TD='align: center']**Infantry Def**[/TD]

[TD='align: center']**Cavalry Def**[/TD]

[/tr]

[tr]

[td]

Rat

[/td]

[td]

25

[/td]

[td]

20

[/td]

[/tr]

[tr]

[td]

Spider

[/td]

[td]

35

[/td]

[td]

40

[/td]

[/tr]

[tr]

[td]

Snake

[/td]

[td]

40

[/td]

[td]

60

[/td]

[/tr]

[tr]

[td]

Bat

[/td]

[td]

66

[/td]

[td]

50

[/td]

[/tr]

[tr]

[td]

Boar

[/td]

[td]

70

[/td]

[td]

33

[/td]

[/tr]

[tr]

[td]

Wolf

[/td]

[td]

80

[/td]

[td]

70

[/td]

[/tr]

[tr]

[td]

Bear

[/td]

[td]

140

[/td]

[td]

200

[/td]

[/tr]

[tr]

[td]

Crocodile

[/td]

[td]

380

[/td]

[td]

240

[/td]

[/tr]

[tr]

[td]

Tiger

[/td]

[td]

170

[/td]

[td]

250

[/td]

[/tr]

[tr]

[td]

Elephant

[/td]

[td]

440

[/td]

[td]

520

[/td]

[/tr]

[/TABLE]