Here is something to consider. I understand you need to illuminate animals with red light so as not to spook them. others suggested 660nm, which could work really well. these lasers are single mode meaning the dot, when defocused, will be a circle more or less. that could work and may be the better option.
would you rather have a big circle or wide rectangle? with the rectangle you could cover a wider area. I'm thinking of a multi-mode 638nm laser, which is a red also, but closer to orange than 660nm. It still looks very red, just not nearly as deep red. if 638nm light will still not spook the animals and you would rather have a brighter and rectangular shaped "spotlight" laser than a circular one, then you need to get a mitsubishi 638nm diode build instead. I suspect either could work, and the 660nm will be cheaper.