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Why do animals try to have sex with other species?

Mark Sterling
Mark Sterling
Research Editor · Jan 22, 2026 · Updated Apr 13, 2026

It's probably evolution. The animals that instinctively screwed every moving thing likely mated with more of their own species (and therefore passed on more of their genes) than the animals that were instinctively selective about their mates. I'm no biologist, but that's just my guess.

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The Short Answer

It's probably evolution. The animals that instinctively screwed every moving thing likely mated with more of their own species (and therefore passed on more of their genes) than the animals that were instinctively selective about their mates. I'm no biologist, but that's just my guess.

Analysis

Key Concepts: Animals, instinctively, it's

This explanation focuses on animals, instinctively, it's and spans 45 words across 3 sentences. At 38% below the average Biology explanation (72 words), the answer takes a direct, no-frills approach — sometimes the simplest explanation is the most effective.

What This Answer Covers

The explanation opens with: “It's probably evolution.” It then elaborates by presenting a contrasting perspective, ultimately building toward a complete picture across 3 connected points.

How This Compares in Biology

Ranked #335 of 500 Biology questions by answer depth (top 68%). This is in the concise tier — a focused explanation that prioritizes clarity over exhaustiveness. Many readers prefer this level of directness.

Frequently Asked Questions

Is there a simple explanation for why animals try to have sex with other species?

It's probably evolution. The animals that instinctively screwed every moving thing likely mated with more of their own species (and therefore passed on more of their genes) than the animals that were instinctively selective about their mates. I'm no…

How detailed is this explanation compared to similar Biology questions?

This is a focused answer at 45 words, ranked #335 of 500 Biology questions by depth. The key concepts covered are animals, instinctively, it's.

What approach does this answer take to explain animals try to have sex with other species?

The explanation uses contrasting perspectives across 45 words. It is categorized under Biology and addresses the question through 1 analytical lens.