Birdwatching is the third stage in Intrepid Cats.
The battle opens with 4 Duches. For every Duche killed, 1 R. Ost spawns. When an R. Ost is killed, another will spawn. This will only happen twice. After that, killing anything will cause 2 more Duches to spawn, so there are a total of 6 Duches and 6 R. Osts in this stage.
It is recommended to use at least 4 meatshields. You can also use Dragon Cat, Crazed Dragon Cat, Macho Legs Cat, and 3-4 main attackers. Special Cats such as Ururun Cat, Bahamut Cat, Holy Valkyrie Cat, Dark Emperor Catdam, Red Riding Mina, and/or Uber Rare Cats if you have them.
Stall the Duches and save money for the attackers. Also, you might need to spam your cats quickly, so you can use Cat CPU too. It might take a few tries to do it right.
This strategy requires somewhat high levels
Lineup: Macho Cat, Crazed Macho Cat, Eraser Cat (has to tank 2 R.Ost hits), Manic Eraser Cat (40), Thaumaturge Cat, Dual Legs and Dragons (Lv 30 min for crazed/manic, +40 for Normal) and a strong hitter like Crazed Bahamut.
Battle Items: Rich Cat (Required for 3 Star, recommended for 2 Star) Sniper The Cat (Required), Cat CPU (recommended)
Battle: Unfortunately, this stage is hard to stall at the start in 3 star (2 star is easier but annoying) and requires you to get ready immediately. Start by spawning your heavy hitter and 2 dragons, don't spawn legs yet. Once you kill the Duches, spawn legs and dragons and turn on CPU AFTER the first R.ost reaches your meatshields. This is where sniper kicks in, it will allow your ranged stacks to attack a target at a time, knocking back 1/4 R.osts and stopping the push, also allows your heavy attack to get in hits.
Strategy 2 (Cheese)
This strategy is mainly for 2 to 4 stars, as the cats are hard to get before the first completion.
Lineup: The best knockback catcombos you have, Eraser Cat, Manic Eraser Cat, Macho Glass Cat (can be replaced by Zamboney Cat for more defense), Lone Cat & Kitten and Cat God the Great. More True Forms may be necessary if doing this in 4 stars.
Cat Cannon: Breakerblast (higher levels can sometimes be helpful, but level 1 is good enough)
Battle: Start by stalling the first four Duches with dual erasers, and save up for Cat God the Great. Once you have enough money for him, spawn him in and save up for Tourist Cat. When Cat God is about to end his attack (where he does the most damage), fire your Breakerblast cannon so that the Duches don't get hit. Timing here doesn't need to be exact, but try your best to make sure Cat God doesn't hit the Duches. Continue this cycle until you kill the base.